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ABLab Solutions > Solutions > Knowledge Centre > Centre > Sample Codes > Codes > Periph Peripheral eral Features > Features > ADC ADC > > 4 Wire Resistive Touch Screen Sensor Interfacing with ATmega32
4 Wire Resistive Touch Screen Sensor Interfa Int erfacing cing with ATmega32
Knoweldge Centre Sample Codes
The term generally refers to touching the display of the device with a finger or hand. Touch screens can also sense
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other passive objects, such as a stylus. Touch screen technolog technology y has been around around for a number of years but advanced touch screen technology has come on in leaps and bounds recently. Companies are including this
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technology into more of their products. The three most common touch screen technologies include resistive, capacitive and SAW (surface acoustic wave). Of all the kinds of o f touch touch screens available, Resistive touch screens are easy to interface, cheap and they have fair sensitivity. Resistive Resistive Touch screens are simply transducers. This touch screen has a resistive layers in both X and Y directions. According According to to the position of position of the touch, their X channel and Y channel resistance changes. So, what we have to do is we have to determine the X and Y Channel resistance to get the th e position of the touch in terms of X and Y co-ordinates. To read r ead the the position of the touch, we have to read touch
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position po sition sequentially i.e. first read X position and then read the Y position. In th this is project, project, we will learn lea rn How to interface interface a 4 wire wire Resistive Touch Touch Screen with AVR ATmega32 microcontroller. Here, we will find the coordinate value of the point at which the touch screen is touched and we will display the coordinate value in a 16X2 Alphanumeric LCD. The AVR ATmega32 Microcontroller Microcontroller will first read the X and Y value of the coordinate point of the touch screen. But, the two outputs of touch screen sensor are analog in nature and microcontroller cannot process the analog signal directly. S o, first it will co c onver nvertt the two analog outputs of touch
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screen sensor to digital values using its analog to digital converter and then it will display the two converted digital
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values in the 16X2 alphanumeric LCD. Now, we will touch the touch screen sensor at different position and we will
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see the changes in its output values(X and Y values) in the 16×2 alphanumeric LCD.
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Hardwares Required AVR Trainer Board-100-1pc
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C Program
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//**************************************************************//
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#include
/*Includes io.h header file where all the Input/Output Registers and its Bits are defined for all AVR microcontrollers*/ #define
F_CPU
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1000000
/*Defines a macro for the delay.h header file. F_CPU is the microcontroller frequency value for the delay.h header
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file. Default value of F_CPU in delay.h header file is 1000000(1MHz)*/
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#include /*Includes delay.h header file which defines two functions, _delay_ms (millisecond delay) and _delay_us
S
(microsecond delay)*/ #define
LCD_DATA_PORT
PORTB
/*Defines a macro for the lcd.h header File. LCD_DATA_PORT is the microcontroller PORT Register to which the data pins of the LCD are connected. Default PORT Register for data pins in lcd.h header file is PORTA*/ #define
LCD_CONT_PORT
PORTD
/*Defines a macro for the lcd.h header File. LCD_CONT_PORT is the microcontroller PORT Register to which the control pins of the LCD are connected. Default PORT Register for control pins in lcd.h header file is PORTB*/ #define
LCD_RS
PD0
/*Defines a macro for the lcd.h header file. LCD_RS is the microcontroller Port pin to which the RS pin of the LCD is connected. Default Port pin for RS pin in lcd.h header file is PB0*/ #define
LCD_RW
connected. Default Port pin for RW pin in lcd.h header file is PB1*/ LCD_EN
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PD1
/*Defines a macro for the lcd.h header file. LCD_RW is the microcontroller Port pin to which the RW pin of the LCD is
#define
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PD2
/*Defines a macro for the lcd.h header file. LCD_EN is the microcontroller Port pin to which the EN pin of the LCD is connected. Default Port pin for EN pin in lcd.h header file is PB2*/
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#include
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/*Includes lcd.h header file which defines different functions for all Alphanumeric LCD(8-Bit Interfacing Method). LCD header file version is 1.1*/ #include /*Includes touchscreen.h header file which defines different functions for 4 wire Touch Screen.TOUCHSCREEN header file version is 1.1*/ int main(void) { DDRB=0xff; /*All pins of PortB are declared output (data pins of LCD are connected)*/
AVR Trainer Board-100
DDRD=0x07;
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/*PD0, PD1 and PD2 pins of PortD are declared output (control pins of LCD are connected)*/ Add to cart int x,y; /*Variable declarations*/ S
adc_init(); /*ADC initialization*/ lcd_init(); /*LCD initialization*/ lcd_string_write(“ABLab Solutions”); /*String display in 1st row of LCD*/ lcd_command_write(0xc0); /*Cursor moves to 2nd row 1st column of LCD*/ AVR USB Programmer lcd_string_write(“www.ablab.in”); /*String display in 2nd row of LCD*/ _delay_ms(500);
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_delay_ms(500); _delay_ms(500); _delay_ms(500); /*Display stays for 2 second*/ lcd_command_write(0x01); /*Clear screen*/
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lcd_string_write(“Sensor Output:-“); /*String display in 1st row of LCD*/ /*Start of infinite loop*/ while(1)//Start of Infinite loop. { x=read_touchscreen_x_coordinate(); /*Reading x-axis value of touch screen*/ lcd_command_write(0xc0); /*Cursor moves to 2nd row 1st column of LCD*/ lcd_number_write(x,10);
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/*X-axis value is displayed in 2nd row of LCD*/ lcd_string_write(” “); /*Two empty space are displayed in LCD*/ y=read_touchscreen_y_coordinate(); /*Reading y-axis value of touch screen*/ lcd_number_write(y,10); /*Y-axis value is displayed in 2nd row of LCD*/ lcd_string_write(” “); /*Four empty space are displayed in LCD*/ _delay_ms(1); /*1ms delay between each reading of touch screen values*/ } }
Connection Guide The step-by-step connection guide for 4 Wire Resistive Touch Screen Sensor Interfacing with ATmega32 project is as follows: Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.
Connect PortB header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.
Connect RS, RW & EN pins of LCD control header with PD0, PD1 & PD2 pins of PortD header respectively in AVR Trainer Board-100 with 1 to 1 Connectors.
Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.
Connect the Pin1, Pin1, Pin1, Pin1 and VCC pins of 4 Wire Resistive Touch Screen header with PA0, PA1, PA2,PA3 and VCC pins of PortA header of AVR Trainer Board-100 with 5 to 5 Connector.
Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.
Connect the AVR USB Programmer to the PC/Laptop’s USB Port directly or with the help of USB AM-AF Cable.
Switch on the power with the help of Power Switch of AVR Trainer Board-100.
Download 4 Wire Resistive Touch Screen Sensor Interfacing with ATmega32 Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.
Touch the Touch Screen sensor at different position and see the output.
Download Materials 4 Wire Resistive Touchscreen Sensor Interfacing with ATmega32 Code v1.1
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Share Download and Header Files Touch Screen Header File v1.1to367 downloads Code 0.85 KB 4 Wire Resistive Touch Screen Sensor Interfacing with ATmega32
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Alphanumeric LCD Header File v1.1
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ADC Header File v1.1
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