DEMO LẬP TRÌNH ADC - [shopdientukhanhhoa.com]

#include <mega8.h>

#include <delay.h>

#include <stdio.h>

unsigned int Tadc;

unsigned char dummyH;

unsigned char dummyL;

#define relay1 PORTB.0

#define relay2 PORTD.7

#define ADC_VREF_TYPE 0x40

unsigned int read_adc(unsigned char adc_input){

    ADMUX=adc_input|ADC_VREF_TYPE;

    // Start the AD conversion

    ADCSRA.ADSC = 1;

    // Wait for the AD conversion to complete

    while (ADCSRA.ADIF==0);

    ADCSRA.ADIF = 1;

    dummyL = ADCL;

    dummyH = ADCH;

    //Tadc=(Tadc<< 8)| ADCL;

return ADCW;

}

void tst_value(){

    if (Tadc<410){

        relay1 =0;

        relay2 =1;

        TCCR1B=0x19;

        OCR1AH=0x01;// 1

        OCR1AL=0xff;// ff  

        PORTD |= (dummyL & 0x7c);

    }

    // if (615>Tadc && Tadc>410)

    // { TCCR1B=0x00; }

    if (Tadc>=460){

        relay1 =1;

        relay2 =0;

        TCCR1B=0x19;

        OCR1AH=0x00;// 1

        OCR1AL=0xff;// ff  

        PORTD|=dummyL & 0x7f;

    }

}

void main(void){

    DDRC.0 = 0;

    DDRD = 0xFF; 

    DDRB.0 = 1;   

    ADMUX=ADC_VREF_TYPE;

    ADCSRA=0x82;

    while (1){

        Tadc=read_adc(0);

        tst_value();

    }

}

/////////////

/************************************************** ***
Project : Board Test
Version : 1.0
Date : 2/25/2007

Chip type : ATmega8535
Program type : Application
Clock frequency : 4.000000 MHz
Memory model : Small
External SRAM size : 0
Data Stack size : 128
************************************************** ***/

#include <mega8535.h>
#include "stdio.h"
#include "realtime.h"
#include "delay.h"
#include "eeprom.h"

#define ADC_VREF_TYPE 0x40

// Read the AD conversion result
unsigned int read_adc(unsigned char adc_input)
{
ADMUX=adc_input|ADC_VREF_TYPE;
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCW;
}

void Init()
{

// ADC initialization
// ADC Clock frequency: 125.000 kHz
// ADC Voltage Reference: AVCC pin
// ADC High Speed Mode: Off
// ADC Auto Trigger Source: None
ADMUX=ADC_VREF_TYPE;
ADCSRA=0x86;
SFIOR&=0xEF;

}


unsigned int Get_Voltage()
{ 
unsigned char i;
unsigned int V=0;
unsigned int Data_ADC=0;

buff[4]=buff[3];
buff[3]=buff[2];
buff[2]=buff[1];
buff[1]=buff[0];
buff[0]=read_adc(7);
for(i=0;i<5;i++) Data_ADC+=buff[i];
V=(unsigned int)((float)Data_ADC/5);
return(V);
}

void main(void)
{

Vadc = Get_Voltage();

}

Good luck to YOU!

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