MONITOREO DE UNA ESTACIÓN METEOROLÓGICA VÍA INTERNET Ismael Guardado Dávila e Isidro Palacios Camacho Directores de tesis: Dr. Jorge De la Torre y Ramos y M. En C. Atziry Magaly Ramírez Aguilera RESUMEN En este proyect proyecto o se presenta presenta el diseño, diseño, desarrollo desarrollo e implementa implementación ción de un sist sistem ema a de tran transm smis isió ión n y rece recepc pció ión n para para el moni monito tore reo o de una una est estac ació ión n meteorológica vía Internet. Se describe cada uno de los sensores utilizados, la etapa de acondicionamiento de las señales para la conexión con el microcontrolador PIC16F877A el cual tiene la función de realizar la captura y digitalización de las señales analógicas de los sensores para poder llevar acabo la etapa de transmisión. También se presenta la etapa de recepción compuesta de un circuito receptor receptor y el microcontrol microcontrolador ador PIC16F84A PIC16F84A encargado encargado de enviar los datos datos a la tarjeta de adquisición NI-ELVIS que permite hacer la comunicación con la PC. Para la construcción de la interfaz entre la tarjeta NI-ELVIS y la PC se crea un programa en LabVIEW el cual es responsable de controlar la lectura de la información enviada a la tarjeta de adquisición, interpretar y crear una base de datos dentro de la PC. Por último se hace un despliegue de los datos en una página página de Internet. Internet.
i
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AGRADECIMIENTOS
A DIOS Por haberme dado la sabiduría y el el entendimiento para poder llegar al final de mi carrera, por proveerme de todo lo necesario necesario para salir adelante y por todo lo que me ha dado.
A MIS PADRES Por el apoyo incondicional que me brindaron a lo largo de toda la carrera, por todos los los sacrificios sacrificios que que hicieron hicieron para que yo siguiera siguiera adelant adelante, e, por sus consejos consejos y comprensión, mil gracias.
A MIS HERMANOS Por su cariño, apoyo y comprensión.
A MIS MAESTROS Por todas las enseñanzas que he recibido.
A MIS ASESORE ASESORES S DE TESIS TESIS A la M. en C. Atziry Magaly Ramírez Aguilera y en especial al Dr. Jorge De la Torre y Ramos por el gran apoyo apoyo brindado brindado para la realizació realización n de este proyecto. proyecto.
Ismael Guardado Dávila
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AGRADECIMIENTOS
A DIOS Por ser ser mi creador creador y porque todo lo que soy, lo que tengo tengo es regalo regalo que el me ha ha dado a cada momento.
A MIS PADRES Por haberme brindado brindado su apoyo apoyo incondicional incondicional en todos todos los momentos momentos más difíciles difíciles de mi vida, vida, así como su su comprensión comprensión y sacrifici sacrificio o que han hecho hecho durante durante mi carrera carrera,, por ser ser las person personas as que que me han impul impulsad sado o para cont continu inuar ar con mis mis estudios y con todos mis proyectos.
A MIS HERMANOS Por su comprensión y cariño.
A MIS MIS ASES ASESOR ORES ES DE TES TESIS IS Al Dr. Jorge De la Torre y Ramos y a la M. en C. Atziry Magaly Ma galy Ramírez Ramíre z Aguilera por compartirme sus conocimientos y por ser parte fundamental fundamental de mi formación académica.
Isidro Palacios Camacho
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MONITOREO DE UNA ESTACIÓN METEOROLÓGICA VÍA INTERNET CONTENIDO GENERAL
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Resumen .............. .............................. ......................................... ................................................... .................................................... ................................. .......ii Lista de Figuras ............... ............................... ......................................... ................................................... .............................................. .................... vi Lista de Tablas.................................................. Tablas........................................................................... ......................................... ........................... ........... viii Capítulo 1. Introducción ............... .............................. ......................................... ................................................... ................................... .......... 1 1.1. Antecedentes ................................................................. ............................................................................................................ ........................................... 1 ............................................................................................................... ......................................... 3 1.2. Justificación ...................................................................... 1.3. Objetivo general ................................................................ ....................................................................................................... ....................................... 4 .............................................................................................. .............................. 4 1.4. Objetivos Específicos ................................................................ 1.5. Hipótesis ................................................................ .................................................................................................................... .................................................... 5 ................................................................................................................... ................................................... 5 1.6. Viabilidad ................................................................ Capítulo 2. Estaciones meteorológicas .............. .............................. .......................................... ......................................7 ............7 ....................................................................................... ................... 7 2.1. Características generales .................................................................... 2.2. Clasificación de estaciones meteorológicas ........................................................ 8 ..................................................................................................... ............................. 8 2.2.1. Climatológica ........................................................................ 2.2.2. Agrícolas ................................................................. ............................................................................................................ ........................................... 8 ........................................................................................................... ........................................... 9 2.2.3 Especiales ................................................................ 2.2.4 Aeronáuticas ................................................................ ....................................................................................................... ....................................... 9 ......................................................................................................... ......................................... 10 2.2.5. Satelitales ................................................................ 2.3. Métodos de adquisición de las variables meteorológicas ............................... 11 2.4. Métodos de transmisión de las variables ........................................................... 11 Capítulo 3. Etapa de transmisión ............... ............................... .......................................... ............................................14 ..................14 ..................................................................... ..... 14 3.1. Tipos de sensores implementados ................................................................ 3.1.1. Sensor de temperatura NRG 110S .............................................................. 15 3.1.2. Sensor de presión atmosférica BP20 .......................................................... 15 3.1.3. Sensor de velocidad de viento NRG 40C ................................................... 16 3.1.4. Sensor de dirección del viento NRG 200P ................................................. 17 3.1.5. Sensor de humedad relativa RH-5 ............................................................... 17 .................................................................. 18 3.1.6. Sensor de radiación solar CMP3 ................................................................ 3.2. Acondicion Acondicionamien amiento to de la señal de los sensores sensores ............................................... 19 3.2.1. Acondicionamiento de las señales ............................................................... 20 ...................................................................... ...... 25 3.3. Conversión analógica/digital (A/D) ................................................................ 3.4. Transmisor RCT-433-AS ...................................................................... ...................................................................................... ................ 27 Capítulo 4. Etapa de recepción y despliegue de datos datos .............. ............................. ............................ .............31 31 4.1. Receptor RCR-433-RP ................................................................ ......................................................................................... ......................... 32 .............................................................................................................. ....................................... 34 4.2. PIC16F84A ....................................................................... 4.3. Interfaz con la PC ........................................................................ ................................................................................................... ........................... 36 ............................................................................................. ............................. 41 4.4. Despliegue de Datos ................................................................ Capítulo 5. Pruebas y Resultados..................................................... Resultados..........................................................................46 .....................46 ............................................................................................. ............................. 46 5.1. Pruebas de sensores ................................................................ 5.2. Pruebas de Transmisión y Recepción ................................................................ 48 48 5.3. Pruebas en LabVIEW
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5.5. Pruebas con sistema completo ........................................................................ ............................................................................ .... 50 .............................................................................................................. ....................................... 51 5.6. Resultados ....................................................................... Conclusiones ............... ............................... ......................................... ................................................... .................................................60 .......................60 Trabajo a Futuro .............. .............................. .......................................... ................................................... ............................................60 ...................60 Bibliografía............... Bibliografía ............................... .......................................... ................................................... ................................................... ............................ 62
APENDICES Apéndice A. Programa del PIC16F877A............................................ PIC16F877A........................................................... .................... ..... Apéndice B. Programa del PIC16F84A........................................... PIC16F84A.......................................................... ....................... ........ Apéndice C. Hoja de datos de sensores................ sensores ............................... ......................................... ................................. ....... Apéndice D. Módulos RF ................ ............................... ......................................... .................................................... .............................. ....
65 72 75 87
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LISTA DE FIGURAS
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Figura 1.1 Barómetro construido por Torricelli en 1643. ............................................... 1 ...................................................................... ...... 2 Figura 1.2 Receptor telegráfico de Morse. ................................................................ .......... 7 Figura Figura 2.1 Diagrama Diagrama de bloques de una estación estación meteorológic meteorológica a automática. automática. .......... Figura 2.2 Diagrama de los posibles sistemas de transmisión de datos. ............ ................. ..... 12
Figura 3.1 Diagrama de bloques para el diseño e implementación i mplementación de la etapa de .................................................................................................... .................................... 14 transmisión................................................................. Figura 3.2 Sensor de temperatura #110S. ................................................................ .................................................................... .... 15 Figura 3.3 Sensor de presión atmosférica NRG BP20. ............................................... 16 Figura 3.4 Sensor de velocidad de viento NRG 40C. .................................................. 16 ......................................................................................... ......................... 17 Figura 3.5 Sensor NRG 200P. ................................................................ Figura 3.6 Sensor RH-5. ........................................................................ ................................................................................................... ........................... 18 ........................................................................................ ............... 18 Figura 3.7 Piranómetro CMP3. ......................................................................... Figura 3.8 Encapsulado PDIP de 40 pines del PIC16F877A. .................................... 19 Figura 3.9 Circuito LM2907 utilizado para el acondicionamiento de la señal del anemómetro. ....................................................................... .................................................................................................. ........................... 21 Figura 3.10 Caracterización de sensor con el LM2907. .............................................. 21 Figura 3. 11Calibración de la veleta. ................................................................ .............................................................................. .............. 23 Figura 3.12 Diagrama de conexiones para la amplificación de la señal del sensor de radiación solar. ......................................................................... ........................................................................................ ............... 24 .................................................................................... ................. 24 Figura 3.13 Pruebas con LM324. ................................................................... Figura 3.14 Comportamiento del LM324 en OrCad. .................................................... 25 Figura 3.15 Diagrama de flujo del código del PIC16F877A. ....................................... 26 ............................................................................ .... 27 Figura 3.16 Transmisor RCT-433-AS. ........................................................................ Figura 3.17 Señal modulada con OOK Señal modulada con OOK utilizada por el transmisor RCT-433-AS. ................................................................ ............................................................................. ............. 28 Figura 3.18 Circuito típico para el transmisor RCT-433.92-AS. ................................. 28 Figura 3.19 Circuito de etapa de transmisión. .............................................................. 29 Figura 4.1 Diagrama a bloques del sistema de recepción y despliegue de información............................... información......................................................... ................................................... ................................. ........31 31 Figura 4.2 Receptor RCR-433-RP. ................ ............................... ......................................... .........................................32 ...............32 Figura 4.3 Módulo receptor RCR-433-RP..............................................................33 Figura 4.4 Encapsulado PDIP de 18 pines del PIC16F84A. ................ ............................... .................. ...34 34 Figura 4.5 Diagrama de flujo del código del PIC16F84A. PIC16F84A. ................ ......................................35 ......................35 Figura 4.6 Sistema NI-ELVIS. .............. ............................. ......................................... ...................................................37 .........................37 Figura 4.7 Diagrama de flujo del programa desarrollado en LabVIEW..................38 Figura 4.8 Etapa de sincronización del instrumento virtual con el sistema si stema de recepción........................................... recepción........................................................... .......................................... .................................. ........39 39 Figura 4.9 Comparación entre señal de entrada y código de sensor.....................39
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Figura 4.12 Pantalla principal de la página Web....................................................42 Figura 4.13 Panel frontal del monitoreo climático. climático. ................ ............................... .................................43 ..................43 Figura 4.14 Panel frontal de datos técnicos...........................................................43 Figura 4.15 Panel frontal frontal de donde estamos. ............... ............................... .........................................44 .........................44 Figura 4.16 Diagrama a bloques del sistema desarrollado.…….....………………..44 Figura 5.1 Comportamiento del sensor de dirección de viento. ................................. 47 Figura 5.2 Diagrama de bloque para la lectura de sensores de temperatura, presión atmosférica, humedad relativa y velocidad de viento. ............. ............... 48 Figura 5.3 Diagrama de bloque para la lectura del sensores de velocidad de viento. ...................................................................... ............................................................................................................. ....................................... 49 Figura Figura 5.4 Indicad Indicadores ores de los puntos cardinales. cardinales. ........................................................ 50 Figura 5.5 Temperatura, 26-09-09, Estación de Agronomía. ..................................... 51 Figura 5.6 Temperatura, 26-09-09, Estación de Guadalupe. Guadalupe. ..................................... 52 Figura 5.7 Temperatura, 26-09-09, Estación de Ingeniería. Ingeniería. ....................................... 52 Figura Figura 5.8 Temperatu Temperatura, ra, 27-09-09, 27-09-09, Estación Estación de Agronomía. Agronomía. ..................................... 52 Figura 5.9 Temperatura, 27-09-09, Estación de Guadalupe. ..................................... 53 Figura 5.10 Temperatura, 27-09-09, Estación de Ingeniería...................................... 53 Figura 5.11 Humedad Relativa, 26-09-09, Estación de Agronomía. ............. ................... ............ ...... 54 ................... ............ ...... 54 Figura 5.12 Humedad Relativa, 26-09-09, Estación de Guadalupe. ............. Figura 5.13 Humedad Relativa, 26-09-09, Estación de Ingeniería. ............ ................... ............. ........ .. 54 Figura 5.14 Radiación Solar, 26-09-09, Estación de Agronomía ............................... 55 Figura 5.15 Radiación Solar, 26-09-09, Estación de Guadalupe. ............................. 55 Figura 5.16 Radiación Solar, 26-09-09, Estación de Ingeniería. ............................... 56 ............... 57 Figura 5.17 Variación de la presión atmosférica respecto a la altitud [40]. ............. ................... ........... ..... 58 Figura 5.18 Presión Atmosférica, 26-09-09, Estación de Ingeniería. ............. Figura 5.19 Velocidad del Viento, 26-09-09, Estación de Ingeniería. ............. ................... .......... .... 58 ................... ........... ..... 59 Figura 5.20 Dirección del Viento, 26-09-09, Estación Estación de Ingeniería. Ingeniería. .............
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LISTA DE TABLAS
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................................................................................... .................. 22 Tabla 3.1 Calibració Calibración n de la veleta veleta .................................................................
Tabla 4.1 Descripción Descripción de los pines del RCR-433-RP. RCR-433-RP. ................................................. 33
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Capítulo Capítulo 1. Introducció Introducción n El conocimiento de las variaciones climáticas ha sido siempre de suma import importanc ancia ia para el desarro desarrollo llo de la agricu agricultu ltura, ra, la navega navegació ción, n, las operac operacione ioness militares y la vida en general. El pronóstico del tiempo es uno de los factores más importantes en nuestra vida diaria ya que permite realizar ciertas tareas sabiendo que no serán impedidas, arruinadas o complicadas por el tiempo, cuando se pueden tomar precauciones precauciones para evitar sus consecuencia consecuenciass o suspenderlas hasta un momento momento más propicio. Una ayuda muy importante para la medición de estos parámetros es la electrónica, mediante la cual se pueden diseñar sistemas que proporcionen las mediciones con un amplio rango de precisión. En este proyecto, se presenta la construcción de un sistema electrónico para la captura, transmisión y despliegue de datos a distancia de una estación meteorológica. Dicho sistema estará inicialmente instalado dentro de la Unidad Académica de Ingeniería Eléctrica; sin embargo, el mismo podrá ser implementado en en cualquier torre de monitoreo climático lo que permitirá tener información información útil útil para el desarrollo desarrollo e instalación instalación de sistemas sistemas eólicos eólicos y fotovoltaico fotovoltaicoss en cualquier cualquier parte del estado de Zacateca Zacatecas. s.
1.1.. Antece 1.1 Anteceden dentes tes Desde la antigüedad se tiene constancia de la observación de los cambios en el clima, asociando el movimiento de los astros con las estaciones estaciones del año y con los fenómenos fenómenos atmosférico atmosféricos. s. Los antiguos antiguos egipcios egipcios asociaban los ciclos ciclos de crecimiento crecimiento del Nilo Nilo con con los los movimie movimiento ntoss de las las estrel estrellas las expli explicad cados os por por los movimi movimient entos os de los los dioses dioses,, mientras mientras que que los los babi babilo loni nios os predecían el tiempo guiándose por el aspect aspecto o del cielo. cielo. Galile Galileo o constru construyó yó el primer primer termó termóme metr tro o en 1607, 1607, seguid seguido o de la invención invención del del baróme barómetro tro por por part parte e de Eva Evangelista Torricelli en 1643, el cual constaba de un recipiente y recipiente y un tubo tubo lleno de mercurio (Hg) cerrado cerrado o de sus extremos, al invertir el tubo dentro dentro del recipiente recipiente se formaba vacío
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El primer descubrimiento de la dependencia de la presión atmosférica en relación relación a la altitud altitud fue realiza realizado do por Blaise Pascal Pascal y René Descartes; Descartes; la idea fue profundizada profundizada luego luego por Edmund Halley. Halley. El El anem anemóm ómet etro, ro, que que mide la velocidad velo cidad del viento, fue construido en 1667 1667 por por Rob Robert Hooke, Hooke, mientras mientras Horace Horace de Saussure Saussure contribuyó contribuyó en el desarrollo desarrollo de los instr umentos umentos meteorológicos meteorológicos más importantes en 1780 1780 con con el higróm higrómetr etro, o, que mide mide la humeda humedad d del del aire. aire. Otros Otros progreso progresoss tecnológicos, ecnológicos, que que son conocidos conocidos principalmente como parte del progreso de la física, física, fueron fueron la investig investigación ación de la dependencia dependencia del del volumen volumen del gas sobre la presión, presión, que conduce conduce a la termodinámi termodinámica, ca, y el experime experime nto de de Benjamin njamin Franklin con el volant volantín ín y el rayo. rayo. El El problema problema de clasificar clasificar ciertas características características climáticas como la las nube nubess y los vientos vientos fue resuelto resuelto cuando Luke Howard y Francis Beaufort Beaufort introdujeron introdujeron un sistem sistema a de clasificación de las nubes nub es en 1802 1802 y de la fuerza del viento viento en 1806, respectivam respectivamente. ente. El verdadero punto de d e cambio cambio fue la invención del telég elégra rafo fo en 1843 que permitía intercambiar información sobre el clima a velocidades velocidades inigual inigualables ables como como se muestra en la figura 1.2.
Figura 1.2 Receptor telegráfico de Morse [2].
A inicios del siglo XX, los progresos en la comprensión de la dinámica atmosférica llevaron a la a la creación creación de la moderna previsión del tiempo calculada en bases matemáticas. En los años 50, los experimen experimentos tos de cálculo cálculo numérico numérico con con computadora mostraron ser factibles. La primera previsión del tiempo realizada
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En la actualidad, la tecnología está cada vez más cerca de los diferentes sectores sociales, brindando soluciones prácticas, rápidas y eficaces a sus problemas. Hoy en día se puede establecer comunicación o controlar el comportamiento de una gran variedad de dispositivos a grandes distancias, en un tiempo casi instantáneo. Es por ello que actualmente existen sistemas de control y monitoreo electrónico especializados y con diversas aplicaciones tales como tarjetas de adquisición de datos, PLCS (Circuitos Lógicos Programables) y una gran variedad de sistemas de control basados en microprocesadores, amplificadores operacionale operacionaless y/o microcontrolad microcontroladores ores [4].
1.2. Justificació Justificación n Actualmente el estado de Zacatecas cuenta con dos redes de monitoreo climático, la primera pertenece al Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP) [5] y la segunda pertenece al Servicio Meteorológico Nacional (SMN) [6]. La red de monitoreo del INIFAP cuenta con 36 estaciones meteorológicas distribuidas en varios puntos del estado de Zacatecas. Estas redes registran mediciones en tiempo real arrojando promedios cada 15 minutos de la temperatura, la humedad relativa, la humedad del follaje, la precipitación, la velocidad del viento, la radiación solar y la dirección del viento, los datos son transmitido transmitidoss vía RF a una distancia distancia máxima máxima de 10 km a la base central central en el Campo Experimental Zacatecas (CEZAC) donde son interpretados y publicados a través de una página de Internet [5]. El principal objetivo de implementar este este tipo de estaciones es para obtener información que permita contribuir al desarrollo de las cadenas agroindustriales, forestales, agrícolas y pecuarias del estado, buscando el aprovechamiento y conservación de los recursos naturales. •
La red de monitoreo del SMN cuenta con dos estaciones meteorológicas automáticas automáticas,, una ubicada ubicada en el municipio municipio de Guadalupe, Guadalupe, Zacate Zacatecas cas y otra otra en el municip municipio io de Sombrer Sombrerete ete,, Zacateca Zacatecas. s. Dichas Dichas estaci estacione oness están equipad equipadas as con •
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SMN tienen un costo aproximado que va de unos $25,000 dólares a unos $35,000 dólares dólares [7]. Es por esto, que que la propuesta propuesta de un sistema sistema económico económico y de fácil fácil implementación con el que se puedan obtener datos meteorológicos confiables y con un alcance de transmisión aceptable para la captura y manipulación representa una opción altamente atractiva. Por Por otr otro o lad lado, o, los recur recursos sos reno renovab vable less com como o son son la energ energía ía sola solarr y la energía energía eólica son relativament relativamente e abundan abundantes tes en el el estado estado de Zacatecas Zacatecas variando su dispo disponib nibilid ilidad ad dependie dependiendo ndo de la ubicac ubicación ión.. Es por por ello, ello, que que en éste éste traba trabajo jo planteamos la necesidad necesidad de obtener mapas solares y eólicos en diferentes puntos puntos del estado estado que permitan obtener obtener la información información necesaria necesaria para poder poder diseñar diseñar e implementar sistemas para la generación de energía eléctrica a través de aerogeneradores y convertidores fotovoltaicos, tomando en cuenta las mismas potencialidades de las estaciones meteorológicas. Debido a que que las estaciones estaciones con con las que cuenta cuenta el estado estado de Zacatecas Zacatecas están orientadas principalmente principalmente a los sectores agrícolas, pecuarios y el estudio de fenómenos fenómenos meteorológ meteorológicos, icos, su localización localización geográfic geográfica a no permite arrojar arrojar datos datos útiles que sirvan para la generación de mapas solares y eólicos, por lo cual es indispensable un sistema de monitoreo remoto y fácil de implementar en cualquier punto donde se desee hacer un estudio del comportamiento de las diferentes variables meteorológicas. Con esto se pretende aprovechar los recursos renovables de una manera adecuada y mejorar la calidad de vida de algunos sectores de la población en Zacatecas, debido a la importancia que tiene en estos momentos el
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1.5.. Hipótes 1.5 Hipótesis is Es posible posible desarrollar desarrollar un sistema sistema de adquisición adquisición y transmisi transmisión ón de datos datos inalám inalámbri brica ca vía RF de bajo bajo costo costo que facilit facilite e el acceso acceso a cualqui cualquier er torre torre de monitoreo monitoreo climático climático además además de acceder acceder a la informac información ión por medio medio de un sitio Web.
1.6.. Viabil 1.6 Viabilida idad d Los recursos necesarios para llevar a cabo el monitoreo de la estación meteor meteoroló ológic gica a montad montada a en las instal instalaci acione oness de Ingenie Ingeniería ría Eléctri Eléctrica ca fueron fueron proporcionados por el Cuerpo Académico “Investigación y desarrollo tecnológico” a través del proyecto FOMIX 16452 Fondo Mixto Mixto CONACYT-Gobierno del Estado convocatoria 2005-01, Proyecto PROMEP “Centro Tecnológico para el Estudio de energías energías Alternas Alternas – CENTENAZ CENTENAZ “y la Unidad Académica Académica de Ingenierí Ingeniería a Eléctrica. Eléctrica. Entre ellos: computadora Dell Pentium 4, NI-ELVIS I, LabVIEW versión 8.2, fuente fuente de poder, multímetro multímetro digital, digital, microcontro microcontroladore ladoress PIC16F877A PIC16F877A y PIC16F84A, PIC16F84A, progra programad mador or USB USB de de micro microcon contro trolad ladore oress PIC modelo modelo PIC-600 PIC-600,, módulo móduloss de tran transm smis isió ión n RCTRCT-433 433-AS -AS y RCR-4 RCR-433 33-R -RP, P, Anem Anemóm ómet etro ro marc marca a NRG tip tipo o NRG NRG #40C #40C,, sensor sensor de tempe temperat ratu ura marca marca tipo tipo NRG NRG 110S, 10S, , velet leta tipo ipo 200 200P, senso ensorr de de presión barométrica barométrica BP20, sensor sensor de humedad humedad relativa relativa RH-5%, RH-5%, y un piranóme piranómetro tro marca Kipp Kipp and Zonen tipo tipo CMP3.
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Capítulo Capítulo 2. Estacione Estaciones s meteorológic meteorológicas as 2.1. Característic Características as generales Una estación meteorológica es una instalación destinada a medir y registrar regularmente diversas variables meteorológicas. Algunos de los parámetros meteor meteoroló ológic gicos os más import important antes es a medir medir son: son: tempera temperatura tura,, humeda humedad, d, presió presión n atmosférica, precipitación precipitación pluvial, velocidad y dirección del viento. Las estaciones meteorológicas se pueden dividir en dos tipos: Convencionales • • Automáticas Estación Meteorológica Convencional: Esta estación típicamente cuenta
con instrumentos convencionales de lectura directa o con c on registro en papel, pero la complejidad y delicadeza en su uso hacen dudar su efectividad. Estación Meteorológica Automática (E.M.A.): En esta estación las lecturas
son acondicionadas para luego ser procesadas mediante microcontroladores o microprocesad microprocesadores ores y transmitida transmitidass a través de de un sistema sistema de comunicac comunicación ión alámbrico ó inalámbrico (radio, satélites, teléfono, etc.) en forma automática. La estación automática funciona de manera autónoma las 24 horas del día a lo largo de todo todo el año, año, utiliz utilizand ando o un sistem sistema a de alime alimenta ntació ción n autónom autónomo o basado basado en en baterías baterías recargables recargables y paneles paneles solares solares [8].
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2.2. Clasificación de estaciones meteorológicas Las estac estacion iones es meteoro meteorológ lógica icass se pueden pueden subdiv subdividi idirr en varios varios tipo tiposs según según sean los objetivos objetivos y los parámetros parámetros que se deseen medir, medir, entre las principal principales es podemos citar las siguientes: • • • • •
Climatológicas Agrícolas Especiales Aeronáuticas Satelitales
2.2.1. Climatológica Una estación climatológica es un área destinada a la obtención y medición de los datos generados por instrumentos que registran los distintos fenómenos meteorológic meteorológicos os que se producen producen en la atmósfera. atmósfera. Esta estación estación comparte comparte los datos meteoro meteorológico lógicoss para predecir predecir el clima clima en un lugar o el comportam comportamiento iento estadístico estadístico de los mismos durante durante los años. Las observaciones que se efectúan se realizan en forma horaria remitiéndolas inmediatamente a un centro recolector de datos, mediante mensajes codificados, por la vía de comunicación más rápida disponible. Estas observaciones se utilizan para una multitud de fines meteorológicos, en general en tiempo real y especialmente para la elaboración de mapas meteorológicos [9].
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El desarrollo tecnológico ha permitido demostrar que la variación del clima afecta la mayoría de los procesos físicos y biológicos que determinan la calidad y cantidad de la producción agrícola. Conocer el clima oportunamente o con anticipación suficiente es necesario para mejorar la producción o reducir efectos adversos para el cultivo. Utilizar de manera oportuna y apropiada los registros climatológicos permitiendo, entre otros posibles, los siguientes beneficios agrícolas: a) b) c) d)
Realiz Realizar ar un un riego riego eficien eficiente. te. Mejora Mejorarr el contro controll de plagas. plagas. Mejorar Mejorar la fertiliz fertilización ación durante durante el desarroll desarrollo o de la planta. planta. Pron Pronos ostitica carr helad heladas as..
Estos beneficios representan para el agricultor mayor producción, menor costo de cultivo, mayor superficie cultivable, producto de mayor calidad, todo lo cual significa en términos finales, mayor ganancia, menores gastos o menos
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segura, segura, regular regular y eficien eficiente te así como para para las activid actividades ades en tiempo tiempo real real de la industria industria de la aviación aviación,, por medio medio de la transmisión transmisión de informacio informaciones nes destinadas destinadas a preparar preparar el vuelo y otorgar otorgar seguridad seguridad a las aeronaves aeronaves y en caso de desastre, desastre, proveen proveen la información información indispe indispensable nsable que permita permita tomar medidas medidas necesarias necesarias para una rápida búsqueda y salvamento de los posibles posi bles sobrevivientes [9]. Uno de los objetivos principales de las estaciones aeronáuticas es permitir a los operadores de las líneas aéreas utilizar directamente los pronósticos meteorológicos para el plan de vuelo y las advertencias exactas del tiempo adverso incluyendo tempestades, formación de hielo, turbulencias y otras durante las diferentes fases de vuelos. La disponibilidad de información meteorológica fiable es un factor decisivo para las operaciones de vuelo y en particular para la elección de la ruta y nivel de vuelo. Esta información permite reducir la carga de combustible, reducir el tiempo de duración del vuelo, elegir las componentes favorables del viento, así de esta manera disminuyen los costos operativos logrando muy importantes ahorros
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Los satélites meteorológicos geoestacionarios orbitan alrededor de la Tierra sobre el el ecuador a unas altitude altitudess de 35.880 35.880 km. Debido a su órbita, órbita, permanecen permanecen estáticos respecto al respecto al movimiento de rotación terrestre y por tanto pueden pueden grabar o transmitir imágenes del hemisferio que tienen debajo continuamente con su sensores de luz visible e infrarrojos. Los satélites de órbita polar rodean la Tierra a una altitud típica de 850 km de norte a sur o viceversa, pasando sobre los polos en su vuelo. Los satélites polares polares están en órbitas órbitas heliosíncronas heliosíncronas,, lo que significa que que pueden observar observar cualquier lugar de la Tierra y ver dos veces v eces al día un lugar con las mismas condiciones generales de luz debido al tiempo solar casi constante. Además, los satélites de órbita polar ofrecen mayor ma yor resolución resolución que sus homólogos geoestacionarios debido a su cercanía con la Tierra [13].
2.3. Métodos de adquisición de las variables variables meteorológicas
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Capítulo Capítulo 3. Etapa Etapa de transmisión transmisión Debido a que la mayoría de las estaciones meteorológicas se encuentran en lugares alejados y algunas se montan a una altura considerable (mayor a 10 metros), es necesaria la utilización de un sistema de control para la adquisición de las variables climáticas así como un sistema de transmisión que sea fiable para
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3.1.1. 3.1. 1. Sensor de temperatura temperatura NRG 110S La temperatura es la medida del contenido de calor de un cuerpo o del medio medio ambient ambiente. e. La tempera temperatura tura se mide mide típica típicamen mente te con termóm termómetr etros, os, los los cuales cuales pueden ser calibrado calibradoss de acuerdo a una selección selección de escalas escalas que dan lugar lugar a las unidades de medición de la temperatura. En el Sistema Internacional de Unidades (SI) (SI) la unidad unidad de tempe temperat ratura ura es el kelvin kelvin,, sin embargo embargo fuera del del ámbito ámbito científic científico o es comú el uso de otras otras escalas escalas de t at la es la Celsi Celsius us [15] [15]
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El ssen enso sorr de pres presió ión n atmo atmosfé sféric rica a BP20 BP20 de NRG NRG Sys Syste tems ms (Fi (Figu gura ra 3.3) 3.3) provee una señal señal de salida salida de voltaje voltaje proporcional proporcional a la presión presión absoluta, absoluta, puede ser ser alimentado con un mínimo de 7V y un máximo de 35V; entrega una señal analógica con un máximo de 5V. Presenta una estructura resistente compuesta de PVC la cual hace hace del BP20 un sensor sensor ideal ideal para recoger recoger datos datos de la presión presión absoluta en los sitios alejados y condiciones climáticas desfavorables [18]. El BP20 se comporta como una resistencia que varía proporcionalmente a la presión atmosférica.
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3.1.4. 3.1. 4. Sensor de dirección dirección del viento viento NRG 200P Se le llama dirección del viento al punto del horizonte de donde proviene el mismo. Se expresa en grados de azimut o puntos cardinales Norte (N), Sur (S), Este (E), Oeste (O), Noreste (NE), Noroeste (NO), Sureste (SE), Suroeste (SO) con respecto al norte magnético [19]. El instrumento que se usa para medir la dirección dirección es es la veleta. veleta.
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Figura 5.11 Humedad Relativa, 26-09-09, 26-09-09, Estación de Agronomía.
Figura 5.12 Humedad Relativa, 26-09-09, Estación de de Guadalupe.
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En las gráficas de la humedad relativa se observa que aunque en algunas horas del día tiene variaciones significativas el comportamiento de los datos medidos por nuestra estación también es parecido con las estaciones comparadas. También se puede notar que las gráficas de la estación de Ingeniería tienen los menores registros de humedad medidos durante los días registrados, esto se debe a que la estación se encuentra montada a una altura de 6m mientras que las del INIFAP se instalan a una altura de 3m.
RADIACIÓN SOLAR En las figura figurass 5.14, 5.14, 5.15 y 5.16 se presentan presentan los resultado resultadoss obtenidos obtenidos por las las estaciones de Agronomía, Guadalupe e Ingeniería.
Figura Figura 5.14 Radiación Radiación Solar, Solar, 26-09-09, 26-09-09, Estación de Agronomía Agronomía.
Figura Figura 5.15 Radiación Radiación Solar, 26-09-09, 26-09-09, Estación Estación de Guadalupe Guadalupe..
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Figura Figura 5.16 Radiación Radiación Solar, 26-09-09, 26-09-09, Estación Estación de Ingeniería Ingeniería..
Como se puede observar en las graficas de radiación el comportamiento es el mismo aunque los valores tengan una variación, esto se debe principalmente a la nubosidad en cada región puede cambiar muy rápidamente y sobre todo en estas fechas, también influye la altura a la que se encuentra instalada la estación ya que puede haber objetos (árboles, cerros, etc.) que obstruyan obstru yan los rayos del sol.
PRESIÓN ATMOSFÉRICA Para validar los datos medidos de la presión atmosférica es necesario considerar las variables que contribuyen a los cambios de presión; el principal factor es la altitud, la presión atmosférica disminuye rápidamente con la altura debido a que la cantidad de aire aire es menor al alejarnos de la superficie terrestre. terrestre. La figura figura 5.17 5.17 muestra muestra el efecto efecto que tiene tiene la variac variación ión de altitu altitud d en en la la presión presión atmosférica además es posible observar que a nivel del mar la presión es de 1013,25 hectopascales (hPa) que equivale a 101.325 kPa.
2 4
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Figura 5.17 Variación Variación de la presión presión atmosférica atmosférica respecto respecto a la altitud [40].
El territorio Zacatecano se encuentra a una altura media de 2230msnm (metros sobre el nivel del mar), lo que conlleva a una presión de 78kPa. En la figura 5.18 se muestra la presión atmosférica medida medida en la estación de Ingeniería, se puede observar que se mantiene en un promedio de aproximado de 76.3kPa equivalente a 2350msnm, este valor es válido ya que la estación se encuentra en las laderas del Cerro de la Bufa el cual tiene una altura de 2496msnm [41], también se comprueba con los datos de la estación del SMN ubicada en la ciudad de Zacatecas a una altitud de 2270m con un promedio de presión atmosférica durante el día de 78.05kPa. Las variaciones que se observan en la figura 5.18 se deben a los cambios de temperatura.
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Figura 5.18 Presión Atmosférica, Atmosférica, 26-09-09, Estación de Ingeniería.
VELOCIDAD DEL VIENTO En la figura 5.19 se muestra los datos obtenidos de la velocidad de viento obteniendo un promedio de 0.987m/s (3.5km/h), se comparan con el promedio de la estación de Guadalupe (5.8km/h) y la de Agronomía con velocidad promedio de 10.6km/h. Las velocidades varían considerablemente entre una estación y otra por la ubicación y topografía del lugar pero se considera aceptable.
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Figura 5.19 Velocidad Velocidad del Viento, Viento, 26-09-09, Estación Estación de Ingeniería. Ingeniería.
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DIRECCIÓN DEL VIENTO La figura 5.20 muestra el comportamiento de la dirección del viento el día 26-09-2009. Su puede observar que la dirección de donde proviene el viento es del sureste debido a que se obtuvo un mayor densidad de valores de esta dirección. Fecha 26-09-09 Estación: Ingeniería Dirección del Viento Norte
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Figura Figura 5.20 Dirección Dirección del Viento, Viento, 26-09-09, Estación Estación de Ingeniería. Ingeniería.
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Conclusiones Se realizo un sistema de monitoreo meteorológico para la Unidad Académica de Ingeniería Eléctrica de fácil instalación en cualquier sitio para obtener información del clima, lo que permita una mejora en la creación de los mapas solares y eólicos para su posterior aprovechamiento de las fuentes renovables de energía en el estado de Zacatecas. Z acatecas. Como Como se se most mostró ró en en los los capí capítu tulo loss 3 y 4 se ha des desarr arrol olla lado do un un siste sistema ma de de transm transmisió isión-re n-recep cepció ción n vía radio radiofre frecuen cuencia cia de bajo bajo costo costo con un alcance alcance máxi máximo mo de transmisión transmisión de 100m a línea línea de vista para la captura captura y manipulación manipulación y con el que se pueden pueden obtener obtener datos meteoroló meteorológicos gicos confiabl confiables es ya que se han comparado comparado con las estaciones más cercanas del INIFAP y el SMN con valores viables. El desarrollo de la programación en LabVIEW en conjunto con la tarjeta de adquisición de datos facilitó en gran medida la manipulación y almacenamiento de los datos entregados por el microcontrolador PIC16F84A. Se elaboró una página Web para que los usuarios puedan tener acceso a los datos climáticos de forma remota y en tiempo real.
Trabajo a Futuro Mejorar la programación del PIC16F877A para realizar una conversión A/D de 10 bits así como la programación en LabVIEW lo que contribuya a una mejor sensibilidad al capturar datos de los sensores Realizar Realizar una interfaz interfaz directament directamente e con el puerto paralelo paralelo o USB de la PC utilizando un microcontrolador, con esto se evitaría utilizar la tarjeta NI-ELVIS, lo que permite una mayor practicidad del sistema desarrollado. Utilizar un amplificador operacional de mayor sensibilidad para la
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Bibliografía [1]
http:/ http://ww /www.v w.vacu acuum-g um-guid uide.c e.com/ om/ima images ges/mu /museum seum_to _torric rricell elli02 i02.gi .gif f
[2]
http:/ http://im /image ages.e s.enca ncarta rta.ms .msn.c n.com/ om/xre xrefme fmedia dia/sh /share aremed med/ta /target rgets/i s/imag mages/ es/pho pho/t0 /t048/ 48/ T048232A.jpg
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[9] [9]
http http:/ ://n /nimb imbus us.c .com om.u .uy/ y/we weat athe her/ r/pdf pdf/c /cap ap2. 2.pd pdf f
[10] [10] http:/ http://ww /www.p w.produ roducemi cemich. ch.org org.mx .mx/Es /Estac tacion ion/in /index dex.ht .htm m [11] http://es.w http://es.wikipe ikipedia.or dia.org/wik g/wiki/Esta i/Estaci%C ci%C3%B3n_ 3%B3n_meteo meteorol%C3 rol%C3%B3gi %B3gica ca [12] http://jro. http://jro.igp.go igp.gob.pe/ b.pe/subwebs subwebs/200604 /200604_talle _tallerradare rradares/docum s/documents/ ents/mestanz mestanza_pres a_pres entacion.pdf [13] http://es.w http://es.wikipe ikipedia.or dia.org/wik g/wiki/Sat% i/Sat%C3%A9l C3%A9lite_m ite_meteoro eteorol%C3%B3 l%C3%B3gico gico [14] Adquisición Adquisición y Transmis Transmisión ión de Datos desde Estaciones Estaciones Meteorológic Meteorológicas as Remotas. S. Rosiek, F.J. Batlles, Dpto. Física Aplicada, Universidad de
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[19] http://www http://www.zacat .zacatecas.i ecas.inifap. nifap.gob.m gob.mx/pub x/publicaci licaciones/Us ones/Uso_de_es o_de_estacio taciones_me nes_meteor teor ologicas_en_la_agricultura.pdf [20] http://www http://www.nrgsys .nrgsystems.c tems.com/sit om/sitecore ecore/conte /content/Pr nt/Products oducts/1900 /1900.aspx .aspx [21] http://www http://www.nrgsys .nrgsystems.c tems.com/sit om/sitecore ecore/conte /content/Pr nt/Products oducts/1904 /1904.aspx .aspx [22] [22] http:/ http://es /es.wi .wikip kipedi edia.o a.org/ rg/wik wiki/H i/Hume umedad_ dad_amb ambient iental al [23] http://www http://www.nrgsys .nrgsystems.c tems.com/sit om/sitecore ecore/conte /content/Pr nt/Products oducts/2047 /2047.aspx .aspx [24] [24] http:/ http://es /es.wi .wikip kipedi edia.o a.org/ rg/wik wiki/R i/Radi adiaci% aci%C3% C3%B3n_ B3n_sol solar ar [25] [25] CMP3 CMP3 Pyrano Pyranome mete terr Instru Instruct ctio ion n Manual Manual.. [26] [26] José José M.ª M.ª Angulo Angulo Usategu Usategui,i, “MICR “MICROCO OCONTR NTROLA OLADOR DORES ES «PIC» «PIC».. Diseño Diseño práctico de aplicaciones. Primera parte: El PIC16F84. Lenguajes PBASIC y Ensamblador.”, Mc Graw Hill 3/Ed. 2003. [27] [27] Hoja Hoja de de espe especifi cificac cacion iones es del sensor sensor 110S. 110S. [28] [28] Hoja Hoja de de espe especifi cificac cacion iones es del sensor sensor BP20. BP20. [29] [29] Hoja Hoja de de espe especifi cificac cacion iones es del sensor sensor 40C. 40C. [30] [30] Hoja Hoja de de espe especifi cificac cacion iones es del sensor sensor RH-5. RH-5. [31] Gray & Meyer, “Análisis “Análisis y Diseño de Circuito Circuitoss Integrado Integradoss Analogicos Analogicos”, ”, Prentice Prentice Hall, 3/Ed. 1995. [32] [32] Hoja Hoja de de dato datoss RCTRCT-43 4333-AS AS.. [33] Ferrel G. Stremler Stremler,, “Introduc “Introducción ción a los Sistema Sistemass de Comunic Comunicación” ación”,, Addison Addison Wesley Longman, 3/Ed. 1993. [34] [34] Hoja Hoja de dato datoss HT12 HT12E. E.
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[39] Cristian Cristian Eduardo Eduardo Boyain, Boyain, Tesis, Tesis, “Desarro “Desarrollo llo de de Instrume Instrumentos ntos Virtuales Virtuales para para Sistemas de Comunicaciones en LabVIEW”, LabVIEW”, Facultad de Ingeniería, Área de Ingeniería Eléctrica, Programa de Comunicaciones y Electrónica, Universidad Autónoma de Zacatecas, 2006. [40] http://www http://www.meteo .meteoexplora exploration. tion.com/mo com/mountai untain/fig n/figures/z2 ures/z2p500.p p500.png ng [41] [41] http:/ http://mx /mx.ge .geoci ocitie ties.c s.com/ om/tal taller lertnt tnt200 2000/c 0/capi apital tal.htm .htmll
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Apéndice A. Programa del PIC16F877A
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TEMP1 TEMP2 TEMP3 TEM TEMP4 TEMP5 TEMP6 CONT2 CONT3 CONT TEMP7
EQU 20H EQU 21H EQU 22H EQU EQU 23H 23H EQU 24H EQU 25H EQU 26H EQU 27H EQU 28H EQU 29H
list p=16f877a #include
ORG 00H BCF STATUS,RP1 BCF BCF STA STATU TUS, S,RP RP0 0 ; Sel Selec ecci cion onam amos os el banc banco o 0. 0. CLRF PORTA ; Limpiamos el puerto A. CLRF PORTb MOVLW B’01000001’ MOV MOVWF ADC ADCON ON0 0 ; CON CONFI FIGU GURA RADO DO FOSC FOSC/8 /8,, CAN CANAL AL 0, MODU MODULO LO ACTIVO SIN INICIAR AUN BCF STATUS,RP1 BSF BSF STA STATU TUS, S,RP RP0 0 ; Sele Selecc ccio iona namo moss el el ban banco co 1. CL CLRF TRISb ; Configuramos como salida al puerto B. MOVLW B’01101111’ MOV MOVWF TRIS TRISA A ; Conf Config igur urac acio ion n de las las entr entrad ada as del del puer puerto to A. MOVLW B’0000000’
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call ms25 ; selecciona el canal 0 BCF STATUS,RP1 BCF STAT STATUS US,R ,RP0 P0 BCF ADCON0,5 BCF ADCON0,4 BCF BCF ADCON0,3 MOVLW d’15’ MOVWF TEMP1
; Sel Selec ecci cion onam amos os el el banc banco o 0. ;Seleccionamos la entrada AN AN0 ;Carga a w con 15 ;Mueve a TEMP1 lo que hay en w
Delay1 DECFSZ TEMP1,1 ;Retardo GOTO Delay1 BSF ADCON0,2 ;Inicia la conver version A/D. PRIMERA_CONVERSION BTFS BTFSS S PIR1 PIR1,6 ,6 ;Pre ;Pregu gun nta si ha termi ermin nado ado la con convers versió ión n GOTO PRIMERA_CONVERSION CALL CONVERSION MOVLW d’13’ MOVWF PORTb call ms25 call bit15 call ms25 clrf portb
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call bit15 call ms25 clrf portb call ms25 ;"Seleccionamos el canal 2" BCF STATUS,RP1 BCF BCF STAT STATUS US,R ,RP0 P0 ; Sele Selecc ccio iona namo moss el el ban banco co 0. BCF ADCON0,5 BSF ADCON0,4 BCF ADCON0,3 MOVLW d’15’ MOVWF MOVWF TEMP TEMP3 3 Delay3 DECFSZ TEMP3,1 GOTO Delay3 BSF ADCON0,2 ;Inicia la conversion A/D. TERCERA_CONVERSION BTFSS PIR1,6 GOTO TERCERA_CONVERSION CALL CONVERSION MOVLW d’11’ MOVWF PORTb call ms25
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CALL CONVERSION MOVLW d’10’ MOVWF PORTb call ms25 call bit15 call ms25 clrf portb call ms25 ;"Seleccionamos el canal 4" BCF STATUS,RP1 BCF BCF STA STATU TUS, S,RP RP0 0 ; Sele Selecc ccio iona namo moss el el ban banco co 0. BSF ADCON0,5 BCF ADCON0,4 BCF ADCON0,3
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Delay7 DECFSZ TEMP7,1 GOTO Delay7 BSF ADCON0,2 ;Inicia la conversion A/D. SEXTA_CONVERSION BTFSS PIR1,6 GOTO SEXTA_CONVERSION CALL CONVERSION goto espera CONVERSION ;;; "Envio de los 4 bits menos significativos al puerto B" BCF STATUS,RP1 BCF BCF STAT STATUS US,,RP0 ; Sele Selecc ccio iona namo moss el banc banco o 0. movfw adresh andlw d’15’ ;Eliminamos los 4 bits mas altos.
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GOTO CICLO8 DECFSZ CONT3,1 GOTO CICLO7 return END
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temp1 temp2 reg_1 CONT CONT2 CONT3 CONT4 Bandera
equ 0x11 equ 0x12 equ 0x13 equ 0x14 equ 0x15 equ 0x16 equ 0x18 equ 0x17
list p=16f84a #include ORG 00H clrf portb clrf porta bsf status,5
;Nos cambiamos al banco1
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; // Rutina para realizar la captura de los códigos y valores de cada seensor // ciclo mov movfw porta rta movwf temp1 call tiempo25 movfw porta movwf temp2
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UNIVERSIDAD AUTÓNOMA DE ZACATECAS “FRANCISCO GARCÍA SALINAS”