Difference between revisions of "ADC"
| Line 46: | Line 46: | ||
==User guide== | ==User guide== | ||
| − | + | Program to demonstrate multi(4) channel ADC, 10bit(0-1023) adc value is displayed on lcd | |
| − | #include "lcd.h" //User defined LCD library which contains the lcd routines | + | #include <avr\io.h> |
| − | #include "adc.h" //User defined library which contains the adc routines | + | #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 */ | /* start the main program */ | ||
| − | void main() | + | void main() |
| − | { | + | { |
| − | + | uint16_t adc_result0,adc_result1,adc_result2,adc_result3; | |
| − | + | /* Initialize the lcd before displaying any thing on the lcd */ | |
LCD_Init(8,LCD_16x2); | LCD_Init(8,LCD_16x2); | ||
| − | + | /* Initialize the adc before starting the conversion */ | |
ADC_Init(); | ADC_Init(); | ||
| − | + | /* Display the adc channel zero-Three values continuously */ | |
| − | + | while(1) | |
{ | { | ||
/*Get the adc values of the first four channels(0-3) */ | /*Get the adc values of the first four channels(0-3) */ | ||
| − | + | adc_result0= ADC_GetAdcValue(0); | |
| − | + | adc_result1= ADC_GetAdcValue(1); | |
| − | + | adc_result2= ADC_GetAdcValue(2); | |
| − | + | adc_result3= ADC_GetAdcValue(3); | |
| − | + | /*Display the adc values on LCD*/ | |
| − | + | LCD_GoToLine(LCD_LineZero); | |
| − | + | LCD_Printf("ch0:%d ch1:%d ch2:%d ch3:%d",adc_result0,adc_result1,adc_result2,adc_result3); | |
} | } | ||
| − | + | } | |
Revision as of 10:50, 14 December 2014
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
| Defination | void ADC_Init() |
| Input Arguments | none |
| Return Value | none |
| Description | This function initializes the ADC module. |
| Usage | void main()
{ ADC_Init(); } |
ADC_GetAdcValue
| Defination | 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 multi(4) channel ADC, 10bit(0-1023) adc value is displayed on lcd
#include <avr\io.h> #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 */
void main()
{
uint16_t adc_result0,adc_result1,adc_result2,adc_result3;
/* Initialize the lcd before displaying any thing on the lcd */ LCD_Init(8,LCD_16x2);
/* Initialize the adc before starting the conversion */ ADC_Init();
/* Display the adc channel zero-Three values continuously */
while(1)
{
/*Get the adc values of the first four channels(0-3) */ adc_result0= ADC_GetAdcValue(0); adc_result1= ADC_GetAdcValue(1); adc_result2= ADC_GetAdcValue(2); adc_result3= ADC_GetAdcValue(3);
/*Display the adc values on LCD*/
LCD_GoToLine(LCD_LineZero);
LCD_Printf("ch0:%d ch1:%d ch2:%d ch3:%d",adc_result0,adc_result1,adc_result2,adc_result3);
} }