[himanshu singh]

help me rectifying error in this code for ADC 

  // program to read analog input from TEMPERATURE SENSOR AND PRODUCE EQUIVALENT OUTPUT AND PRINT IT ON LCD

#include <avr/io.h>

#include<util/delay.h>

#include “lcd.h”

#include “lcd.c”

#define F_CPU 1000000UL

void main()

{

 

char ch; // declaring ch as character variable of length 4, used to select 1 channel out of 7

unsigned long int adc_result; // declaring adc_result variable as unsigned integer used to to store adc result which willbe passed onto lcd

 

lcd_init (LCD_DISP_ON);

lcd_clrscr() ;

 

initADC (); // initialise adc funtion

 

 

lcd_gotoxy(0,0);

lcd_puts(“ADC TEST”);

lcd_gotoxy(0,1);

lcd_puts(“ADC= “);

 

while (1)

{

 

adc_result= ReadADC(); // store adc result in adc_result variable

sprintf(ch,”%4d”,adc_result); // to print this result in lcd, first store it in ch variable

lcd_gotoxy(4,1);

lcd_puts(ch); // display the result on lcd

_delay_ms(100);

}

}

 

void initADC() // ADC INITIALISATION FUNCTION

{

ADMUX=(1<<REFS0)|(1<<REFS1); // VOLTAGE REFERENCE AS 2.56

ADCSRA= (1<<ADEN)|(1<<ADPS1)|(1<<ADPS0);// ENABLING ADC AND SELECTING PRESCALING OF 8

}

 

unsigned long int ReadADC(void) // ADC READING FUNCTION, RETURN VALUE IS OF 16 BITS SO UINT16_T AND CHANNEL LENGTH AS INPUT ARGUMENT

{

                      // enabling 0to 7 channels

ADMUX|= (1<<MUX0);

 

ADCSRA |= (1<<ADSC); // start adc conversion

 

while (!(ADCSRA & (1<<ADIF))); // wait until conversion is complete

ADCSRA|= (1<<ADIF); // clear adif flag after completion, yes its 1 to clear it

return (ADC); // return the digital output

}

 

[Author]

Posts