ADC Revision as of 17:00, 27 December 2014 by Explorer (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

ADC

This library provides the functions for initializing the adc and to get the raw adc values. In case of AVR/PIC/ARM or other high end controllers the inbuilt adc is used. In case of 8051/8052 as it doesn't have an inbuilt adc, ADC0809(8-bit) adc is used.

ADC_Init

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Definition	void ADC_Init()
Input Arguments	none
Return Value	none
Description	This function initializes the ADC module.
Usage	void main() { ADC_Init(); }

ADC_GetAdcValue

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Definition	uint16_t ADC_GetAdcValue(uint8_t channel)
Input Arguments	uint8_t : channel number
Return Value	uint16_t(10 bit ADC result)
Description	This function does the ADC conversion for the Selected Channel and returns the converted 10bit result. The adc value per bit depends on the resolution of the ADC. For AVR/PIC(10-bit adc) the adc value per lsb will be 5/1023=0048v
Usage	uint16_t adc_result; adc_result = ADC_GetAdcValue(0); //Adc value for channel 0

User guide

/*Program to demonstrate 2-channel ADC. The resultant adc value is displayed on lcd */
#include "lcd.h"   //User defined LCD library which contains the lcd routines
#include "adc.h"   //User defined library which contains the adc routines
 
 
/* start the main program */
int  main()
{
	uint16_t adc_result0,adc_result1;
 
 
	LCD_Init(8,2,16);  /* Initialize the lcd(8-bit 2X16type) */
 
 
	ADC_Init();   /* Initialize the adc before starting the conversion */
 
	LCD_DisplayString(" 2-Channel ADC ");
 
 
 
	while(1)      /* Display the adc channel zero,One values continuously */
	{
 
		adc_result0= ADC_GetAdcValue(0);  /*Get the adc values of ch0, ch1*/
		adc_result1= ADC_GetAdcValue(1);
 
 
		LCD_GoToLine(E_LcdLineTwo);    /*Display the adc values on LCD*/
		LCD_Printf("C0:%d C1:%d ",adc_result0,adc_result1);
	}
 
	return 0;
}