UNIVERSIDAD DE ORIENTE NÚC NÚ CLEO DE ANZOÁ ANZOÁTE TEGUI GUI ESCUELA DE INGENIE NGENIERÍA RÍA Y CIENCIAS APLIC APLICAD ADAS AS DEPARTAMENTO DEPARTAMENTO DE ELECTRICI RICIDA DAD D
Por Luis. D. Urdaneta G.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE OR IENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE INGENIERÍA Y CIENCIAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICI DAD DAD
LABORATORIO DE CIRCUITOS DIGITALES Punta Lógica
OBJETIVO GENERAL: Construir y evaluar experimentalm experimentalmente ente una punta de prueba de circuitos digitales.
OBJETIVOS OBJE TIVOS ESPECÍFICOS: ESPECÍFICOS: • Iniciar al estudiante en el uso de circuitos integrados de las familias lógicas de circuitos integrados TTL y CMOS. • Distinguir los niveles lógicos permitidos para las entradas y salidas de circuitos digitales de ambas familias. • Conocer los parámetros de funcionami funcionamiento ento de circuitos digitales digitales de distintas tecnologías. • Construir una punta de prueba para circuitos fabricados con tecnologías TTL y CMOS. • Evaluar experimentalmente experimentalmente el circuito ensamblado. ensamblado.
PROCEDIMIENTO: 1. Diseñe el divisor de tensión del comparador de ventana y construya el circuito mostrado en la figura 1
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2
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3
ESPECIFICACIONES: •
Alimentación desde el circuito bajo prueba.
TTL TT L
VCC = 5 V ± 5%
CMOS
3 V ≤ VDD ≤ 18 V
•
Protección Protección contra sobrevoltaje sobrevoltaje e inversión in versión de la tensión de alimentación.
•
Compatibilidad Compatibilidad con circuitos integrados:
TTL TT L 74 74L 74S 74LS 74AS 74ALS 74F
CMOS Serie 4000 74C 74HC 74HCT
TABLA PARA INTERPRE TAR LA LECT URA DE DE LO S DIODOS LUMINOSOS
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4
ASIGNACIÓN: 1.
Analice Analice con detall deta llee el circuito circuito de la punta de prueba, justifique la la presencia de cada bloque.
2.
Para TTL y CMOS, determine y grafique la función de transferencia del comparador de ventana. Especifique las tensiones de interes.,
3.
Usando las especificaciones de margen de ruido para tecnología TTL ( Ver: Wakerley J. Digital Circuits) señales las las subfamili subfamilias as lógicas lógicas cuyos miembros miembros pueden probarse con la punta de prueba.
4.
Calcule Calcule el tiem t iempo po en alto del multivibrador multivibrador monoestable. Discuta el resultado. r esultado.
5.
Dibuje Dibuje un diagrama de tiempos de las señales se ñales Vi, TRIGGER y OUTPUT, cuando la entrada es un tren de pulsos de frecuencia 50 Hz y ciclo de trabajo 50%.
6.
Rediseñe el instrumento instrumento para pa ra disponer de dos modos de funcionam funcionamiento iento selecMEMORIA . cionados por medio de un interruptor de modo PULSO / MEMORIA En la posición MEMORIA la punta debe detectar transiciones rápidas de nivel nivel o pulsos muy estrechos ( glitches), reteniendo la la ocurrencia del evento de acuerdo con la dirección de la conmutación. Si la transición es positiva los indicadores de nivel bajo y de pulso deben activarse, act ivarse, mientras que qu e si es negativa se iluminaran iluminaran los indicadores de estado lógico uno y de pulso.
3.- Simule en el µC la punta de prueba y presente un disquete con los archivos correspondientes.
Sugerencia: Incluir el modo MEMORIA no requiere la conexión conexión de un gran número de componentes componentes (uno, apenas) al circuito de la figura 1. Analice el modo de funcionamiento del temporizador temporizador LM555 antes de realizar esta parte de la asignación.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE OR IENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE INGENIERÍA Y CIENCIAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICI DAD DAD
LABORATORIO LABORATORIO DE CIRCUITOS DIGITALES Detector de movimiento
OBJETIVO GENERAL: Diseñar, construir y evaluar una máquina de estados para presentar el número de personas que permanecen en el interior de un local.
OBJETIVOS OBJE TIVOS ESPECÍFICOS: ESPECÍFICOS: • Diseñar un sensor de dirección de movimiento. movimiento. • Usar un contador BCD ascendente/descendente. • Presentar información información digital en un indicador indicador de siete segmen s egmentos. tos.
PROYECTO: El circuito debe contar el número de personas que pasan por un punto. Dos fototransistores son usados para detectar el movimiento de las personas a través de una entrada. Se supone que sólo puede pasar una persona a la vez por el pasillo de acceso. Un diagrama simplificado del sensor se muestra en la figura 1.
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6
Cuando la vía de acceso al local está libre, los detectores ópticos perciben la luz desde las lámparas y se mantienen en saturación. Las tensiones en las líneas A y B son ambas cero. Cundo un objeto pasa a través del transistor, bloquea la luz emitida por LP1 o LP2, lo cual ocasiona que el foto NPN correspondiente se corte y la tensión de colector respectiva suba a VCC. Su trabajo consiste en diseñar un circuito contador de acuerdo con el diagrama funcional de la figura 2. El circuito óptico de entrada no debe ser diseñado. Para simplificar la aplicación, se supone que la capacidad del local es de nueve personas. Aunque el diagrama de la figura 2 no lo indica, debe iluminarse un LED cuando el local esté lleno. lleno. Las entradas de circuito son: un pulsador RESET para iniciar a cero el contador, un interruptor AJUSTE para presentar, en forma manual, el número de personas en la sala, las dos líneas A y B desde el sensor de movimiento y una señal CLK de reloj para sincronizar la máquina de estados. Las salidas salidas del control contro l lógico lógico son: una señal D que ordena disminuir en 1 la cuenta, una línea I que incrementa en 1 el contador y un comando E de error. El contador debe incrementarse cuando el movimiento es hacia la derecha y debe disminuir cuando el movimi movimiento ento es hacia la izquierda. izquierda. El diagrama de estados debe considerar todas las transiciones que deben ocurrir cuando la persona se mueve en uno u otro sentido. Si en algún momento ocurre una transición no esperada, el control debe ir hacia el estado inicial y activar la salida E.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES Cerradura digital con eeprom
OBJETIVO GENERAL: Construir y evaluar experimentalm experimentalmente ente una máquina máquina de estados estado s finitos. finitos.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS: ESPECÍFICOS: • Usando una memoria EPROM, diseñar el control lógico de una cerradura de combinación digital. • Realizar Realizar el montaje del circuito. • Probar el funcionamiento funcionamiento del control co ntrol secuencial secu encial..
PROYECTO: Diseñar una cerradura digital digital para una puerta. Cuando la combinación combinación introducida sea la correcta se debe disparar un relé que permita la activación del mecanismo que
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8
La función de cada elemento de la consola se indica a continuaci co ntinuación: ón:
Pulsador para introducir dígitos Indicador de espera de dígito Anuncio de puerta abierta (Se apaga)
Fig. 2. Funciones de los elementos del pan el.
La figura 3 muestra el diagrama funcional del sistema a diseñar. Para abrir la cerradura de combinación se requiere que un control digital detecte y reconozca una secuencia numérica específica N 1, N2, y N3 introducida por medio del pulsador S 1. Los pasos necesarios para accionar el mecanismo que abre la puerta se describen a continuación:
PASO 1: La operación se inicia pulsando S 1 hasta que el LED se apague. Esto debe ocurrir en los cinco segundos segundos siguientes a la activación del pulsador. Al presionar S1 durante un tiempo lo suficientemente largo para que ocurra una transición en reloj1, oi conmutará a nivel alto, pasando el sistema a un estado de inicio con el diodo luminoso apagado. A partir de este evento se introducen los 3 dígitos de la combinación.
PASO 2 Con el LED desactivado, se disponen de cinco segundos para pulsar N 1 veces veces el interrupin terruptor S1 e introducir el prim er dígito de la combinación.
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9
*
Fig.3. Diagrama funcional de la cerradura digital
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10
Fig.4. Control lógico con EPROM
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11
GENERACIÓN DEL ARCHIVO A GRABAR EN LA EPROM . Dos opciones: 1. Escribir un código en lenguaje lenguaje de alto nivel. 2. Usar el programa ORCAD EXPRESS.
PROCEDIMIENTO: 1.- Realice Realice el montaje del circuito. circuito. 2.- Verifique Verifique el funcionamiento funcionamiento de la red. 3.- Use el programa PROTEUS 6.9 para simular simular la la máquina máquina antes de probarla. IncluIncluya el relé y los LEDs en el circuito a simular. simular.
NOTA: •
El relé de 12 V lo entregará el preparador. Usted debe medir los parámetros necesarios para reali rea lizar zar el diseño.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES Arbitro de bus
OBJETIVO GENERAL: Diseñar, construir y evaluar un circuito lógico para el control del uso de un bus.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS: ESPECÍFICOS: • Diseñar un circuito que realice la técnica de arbitraje centralizado por con-
sultas con prioridad rotativa para cuatro periféricos. • Construir y verificar el funcionamiento del diseño.
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13
Debido a que al bus se conectan varios periféricos los cuales pueden solicitar simultáneamente acceso al canal, se requiere alguna técnica para controlar el acceso. Arbitrar el bus consiste en seleccionar de entre los dispositivos que esperan, el maestro que usará el bus. Debido a que sólo un periférico puede transferir a la vez información por las líneas de comunicación, es esencial un árbitro constituido por circuitos digitales que dependiendo de la prioridad asignada a cada periférico, autorice el uso del canal a la unidad que corresponda en el momento apropiado. Debido a que se tienen cuatro periféricos se requieren dos bits para identificar cada dispositivo, como indica la figura 1.
Periférico
x1
x0
D0 D1 D2 D3
0 0 1 1
0 1 0 1
Para simplificar el diseño, se asume que la señal de solicitud interna de uso de bus de cada dispositivo se mantiene activa mientras el periférico use el bus. Esto elimina la necesidad de flip-flops para retener la señal de petición. Tampoco se usan registros para mantener la dirección del dispositivo. De modo que la estructura de cada perifé-
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14
Como el arbitro debe presentar en secuencia el identificador de cada periférico sobre las líneas de identificación de dispositivo, conviene usar un contador binario para generar las señales x1 y x0. Una elección correcta es el circuito 74LS169.En la figura 3 se muestran las señales de entrada y salida salida del árbitro. árbitro .
Fig.3. Arbitro del bus El interruptor lógico inicio de la figura 3 habilita el funcionamiento del circuito. Con este interruptor desactivado no habrá respuesta a las solicitudes de uso del bus. Con el interruptor prioridad en uno, la prioridad de los dispositivos es D0 D1 D2 D3 , siendo D0 el periférico de mayor prioridad. Colocando prioridad en cero lógico se invierte la
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15
cuenta desde 00-11 o desde 11-00. También tiene dos entradas de habilitación para detener la cuenta en cualquier instante. Su trabajo consiste en diseñar el circuito digital para el árbitro mostrado en la figura 1, de acuerdo con las especificaciones dadas. El circuito construido debe tener nueve diodos luminosos. Cuatro de estos (uno por periférico) indicarán si el dispositivo correspondiente solicita acceso al bus. Uno de otros cuatro (uno por periférico) señalará cual dispositivo está usando el bus. El noveno LED se iluminará cuando el bus esté ocupado.
OBSERVACIONES: • Diseñe los comparadores de 2 bits usando puertas lógicas. • Use resistencias limitadoras para los diodos luminosos. Calcule el valor apropiado para de Rlim. • Calcule el valor del resistor R de los in terruptores lógicos. lógicos. • El controlador debe realizarse con lógica combinatoria combinatoria exceptuando exceptuando el contador.
PROCEDIMIENTO: 1.- Realice Realice el montaje del circuito.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
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17
Los datos transmitidos por el dispositivo externo son recibidos por la entrada serie E serie serie y la señal de reloj se aplica a la entrada CLK de la figura 1. El circuito de comunicaciones acepta continuamente un flujo de bits por la línea E serie serie y los agrupa como caracteres de 8 bits (bytes) presentándolos en las salidas D0-D7 . Cuando se haya completado la transferencia de un byte, el controlador activará la señal R x-Listo para indicar al computador que se ha recibido un carácter desde el dispositivo de E/S y que su código está en D0-D7 . Además, con la entrada del octavo bit el circuito receptor detectará si la paridad del dato transferido es impar. Una vez que el computador lee el carácter, aplica al controlador una señal Dato-Ok que desactiva la salida R x-Listo como antesala a la aceptación del dato siguiente.
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18
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES Control de Nivel
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20
Se requiere diseñar un circuito digital para el tanque mostrado en la figura 1. Para realizar su función el controlador deberá accionar (abrir/cerrar), de acuerdo con el nivel del tanque, la válvula V e de entrada de líquido y la válvula V s de salida de líquido. La magnitud del nivel es medida continuamente por un sensor/detector de nivel bits M 7 (no mostrado) el cual entrega una palabra de 8 bits M 7 -M 0. La función que debe ejecutar el controlador es seleccionada por el operador mediante pulsadores ubicados en un panel como muestra la figura 2.
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21
Como indica la figura 3, existen cuatro pulsadores pulsadores de función f unción y dos indicadores luminosos para el estado de las válvulas. FUNCIONES:
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22
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE
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PROYECTO: Su trabajo consiste en diseñar una unidad central de proceso ( CPU ) primitiva, constituída por una máquina de estados que controla una unidad aritmética de 4 bits. La sección
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FUNCIONAMIENTO: El control lógico debe gobernar el circuito, los pasos a seguir para ejecutar una operación son los sigui s iguientes: entes:
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61
Fig.3. Detectores de cruce por cero.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES Medidor de frecuencia
OBJETIVO GENERAL: Construir Const ruir y evaluar experimentalmente un medidor digital digital de frecuencia. frecue ncia.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS: ESPECÍFICOS: la señal de entrada entrada en una pantalla de tres • Medir y presentar la frecuencia de la dígitos • Comprobar el funcionamiento funcionamiento del circuito.
PROYECTO: La medida medida digital de frecuencia frecuencia se realiza combinando combinando una base de tiempo tiempo con una cadena contadora, como muestra el diagrama en bloques de la figura 1. Siendo N el número de ciclos de una señal en el tiempo t, la frecuencia promedio de la onda viene dada por la expresión: f x =
N t
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63
Si el intervalo de la ventana de medida, t , es de 1 segundo, la la salida salida del contador será la frecuencia desconocida expresada en Herz.
Fig. 1. Principio Pr incipio de medición de frecuencia.
El control lógico mostrado en la figura 1 es una máquina de estados sincronizada por la señal reloj y con la base de tiempo de medida f b como entrada. Las tres salidas del circuito secuencial: reset, contar y mostrar se encargan de controlar el proceso de medida y presentación de la frecuencia f x de la señal de entrada al instrumento. El modo de operación es el siguiente: al inicio se pone a nivel alto la línea reset para llevar a cero la cadena de contadores BCD. A continuación se suprime el comando de reset y se activa act iva la señal contar permitiendo que el contador registre los pulsos de entrada. Un segundo después se inhibe el paso de la entrada a través de la puerta AND y se usa mostrar para aplicar un pulso de reloj a la entrada de los latches para presentar en los indicadores el estado del contador. A continuación el contador vuelve a cero y se inicia inicia un nuevo ciclo c iclo de medida.
Para generar la base de tiempo f b use un circuito temporizador LM555 funcionando como multivibrador aestable. El ancho del pulso de salida debe ser de 1 segundo y el ciclo de trabajo de 90.9 %. La frecuencia frecuencia de la la señal reloj debe ser mucho mayor que la de f
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64
Fig. 2 Diagrama en bloque del medidor de digital de frecuencia.
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65
El circuito de la figura 3 puede usarse para permitir la medida de frecuencia de señales alternas con variación variación lenta.
Fig. 3. Circuito de acoplamiento de entrada
PROCEDIMIENTO: 1.- Realice Realice el montaje del circuito. circuito. 2.- Verifique Verifique el funcionam funcionamiento iento del medidor. medidor. 3.- Justifique el uso de: El rectif rect ificador icador y el condicionador de señal. 4.- Modifique Modifique el circuito circuito de modo que tenga tres rangos rango s de medida: medida: x1, x10 y x100. x100. Incluya el rediseño en el informe.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLE O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES Medidor de distancia
OBJETIVO GENERAL: Construir Const ruir y evaluar experimentalmente un medidor digital digital de distancia. dista ncia.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS ESPECÍFICOS : • Introducir el concepto de memoria de almacenamiento temporal. • Aprender a realizar la conversión de las señales suministrada por trasductores en información apropiada para ser presentada en forma digital Diseñar y construir un medidor de distancias basado en el uso de ondas de ultrasoni-
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67
Un receptor, usualmente el mismo trasductor que actúa como emisor, detectará el eco reflejado. La figura 1 muestra un esquema general del fundamento de la medición digital de distancias.
Transductor
E m i s o r R e c e p t o r
Tx
d Rx
Metros
M e d i d o r d e d i s t a n c i a
Tx Rx
Fig. 1. Principio de medición de distancias con un tran sductor sductor ultrasónico. El tiempo que transcurre entre el instante de la emisión del pulso T x, y la detección de la señal reflejada R x, debe ser procesado y convertido en una indicación de distancia por el circuito de medida de la figura 1. En ésta no se muestran: la fuente de poder, ni la señal de sincronismo que envía el modulo de medida al Emisor/Receptor de ultrasonido. Las señales T x y R x aplicadas al bloque de medida son una versión limpia de la onda transmitida y del eco reflejado, las cuales se presentan en el diagrama de tiempo de la figura 2.
+5 V
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68
Determinado T d este valor, y considerando que la velocidad de propagación del sonido en el aire es una magnitud conocida, bastará con aplicar la formula:
d = V sonido × T d para lograr la indicación digital de la distancia. Su tarea en este ensayo consiste en diseñar el modulo de medición de acuerdo a lo descrito y basándose en las especificaciones que se dan a continuación.
FUNCIONAMIENTO DEL MEDIDOR DE DISTANCIA Para entender el funcionamiento del circuito digital de medición debe atenderse al diagrama funcional de la figura 4 y el diagrama de tiempo de la figura 3.
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69
res de siete segmentos. Al arribo del pulso reflejado, fin de la medida, la señal ap conmuta a uno lógico, activando el circuito de memoria temporal, el cual retiene la información de salida de los contadores en el instante de la llegada del eco reflejado. Los indicadores mostrarán la medida en metros, con tres dígitos significativos, desde la ubicación del trasductor hasta el blanco detectado. Para la obtención de una medida correcta en la pantalla se requiere que el contador correspondiente al dígito menos significativo avance a un ritmo de 1 pulso/cm. Realice el diseño considerando que la velocidad del sonido en el aire es, aproximadamente, 349.61 m/s a la temperatura de 30° 30 ° C.
PROCEDIMIENTO: 1.- Realice Realice el montaje del circuito circuito proyectado. 2.- Verifique Verifique el funcionam funcionamiento iento del medidor. medidor. 3.- Simule el diseño.
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70
Fig. 4 Diagrama en bloque del medidor de digital de distancia.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLEO O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO LABORATORIO DE DE CIRCUITOS DIGITALES Control de un Ascensor
OBJETIVO GENERAL: Diseñar, construir y evaluar un control lógico para un ascensor de un edificio de cuatro pisos.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS ESPECÍFICOS :
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72
La función de cada elemento se indica indica a continuación:
Planta baja Piso 1
Piso 2 Piso 3
Indicador de pìso Subiendo Bajando
Fig.2 Funciones de los elementos del panel.
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73
Fig.3 Diagrama funcional del circuito circuito de control
Las salidas salidas del registro registro se aplican al control contro l del ascensor, el cual debe trasladarse hacia el piso correspondiente. Las salidas del control son cuatro: Q2 y Q1 indican el piso en el cual se encuentra el elevador. Esta información debe presentarse en BCD. Las otras salidas: z1 y z2, notifican si el equipo está subiendo o descendiendo.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLEO O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO LABORATORIO DE DE CIRCUITOS DIGITALES Control de ascensor con EPROM
OBJETIVO GENERAL: Diseñar, construir y evaluar un control lógico para un ascensor de un edificio de cuatro pisos.
OBJETIVOS OBJ ETIVOS ESPECÍFICOS: ESPECÍFICOS: • Usar el circuito decodificador de la práctica de control de nivel para
los pulsadores de selección de piso.
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75
La función de cada elemento de la consola se indica a continuaci co ntinuación: ón:
Planta baja Piso 1
Piso 2 Piso 3
Indicador de piso Subiendo Bajando
Fig.2 Funciones de los elementos del panel.
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76
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77
Las salidas del registro se aplican a las las líneas líneas de direcciones de la memoria de modo modo que el ascensor se traslade hacia el piso correspondiente. Las salidas del control son: O1 y O0 indican el piso en el cual se encuentra el elevador. La salida O 2 señala que el ascensor está subiendo y O 3 que está bajando. O 7 O6 O5 y O 4 se conectan a los segmentos a(d ), ), c, e, y f . El segmento b siempre estará activado y el g corresponde al complemento de la salida O 0. El número del piso debe presentarse en BCD. El indicador es de tipo ánodo común.
PROCEDIMIENTO: 1.- Realice Realice el montaje del circuito. circuito. 2.- Verifique Verifique el funcionam funcionamiento iento del circuito. circuito.
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚCLE NÚCLEO O DE ANZOÁTEGUI ESCUELA DE I NGENIERÍA Y CI ENCIAS APLICADAS APLICADAS DEPARTAMENTO DEPARTAMENTO DE EL ECTRICIDAD
LABORATORIO DE CIRCUITOS DIGITALES
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79
La sección básica básica del voltímetro voltímetro es un convertidor análogo-digital (CAD) de rampa rampa doble. En el proceso de conversión se genera una rampa de tensión con pendiente negativa, la cual es proporcional a V e . Al inicio de la rampa se permite el paso de pulsos de reloj hacia el contador hasta el instante que el mismo alcance su módulo N . En ese momento se inicia la generación de una rampa positiva proporcional a una tensión interna de referencia r eferencia V r r. Durante la generación de esta señal el contador ha estado activado registrando la cuenta de pulsos ocurridos desde el punto de cambio de pendiente de la rampa.
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80
• Cuando el comparador sube a +5V, el control lógico conmuta reset a nivel bajo permitiendo el funcionamiento de la cadena de contadores. En el intervalo comprendido entre 0 y t 1, la señal V e es integrada como ilustra la figura 2, siendo la tensión de salida del integrador, V a
V e
t ,
con
= R1C
La rampa negativa V a continúa generándose hasta el instante que el contador alcanza su módulo N , como muestra la figura 2.
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Como muestra la figura 2, V a
V r
t
es ahora una rampa con pendiente
positiva, debido a que la tensión V r r es negativa.
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OBSERVACIONES: Para realizar el interruptor S 1 se usan dos puertas de transmisión analógicas del tipo 4016. Estos dispositivos se activan con un nivel alto en la entrada V C. El voltaje a me-
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UNIVERSIDAD UNIVERSIDAD DE DE ORIENTE ORI ENTE NÚ
O DE ANZOÁTEGUI
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