ADC Using PIC16F877A Revision as of 13:51, 5 May 2016 by Explorer (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

In this tutorial we are going to discuss how to use the inbuilt PIC16f877A ADC.
We will be reading the ADC values from chanel Zero and transmitted on UART at 9600 baudrate.

PIC16F877A ADC pins

PIC16F877A has inbuilt 8channel 10-bit ADC. Below tables shows the ADC pin mapping.

Adc Channel	Pic16f877a Pin	Pin Function
0	PA.0	AN0
1	PA.1	AN1
2	PA.2	AN2/VREF-
3	PA.3	AN3/VREF+
4	PA.5	AN4
2	PE.0	AN5
3	PE.1	AN6
4	PE.2	AN7

Code

Below is the sample code to read the ADC value of channel0 and sent it on UART at 9600 baud rate.
As the POT is connected to ADC0, the values can be varied using this POT.

	#include "adc.h"
	#include "uart.h"
	int main()
	{
	int adcValue;
	ADC_Init(); /* Initialize the ADC module */
	UART_Init(9600); /* Initialize UART at 9600 baud rate */
	while(1)
	{
	adcValue = ADC_GetAdcValue(0); // Read the ADC value of channel zero
	UART_Printf("ADC0 Value:%4d \n\r",adcValue); // Send the value on UART
	}
	return (0);
	}

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