PIC18F4520 ADC on Starter Borad Revision as of 13:43, 10 August 2016 by Sharana (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

In this tutorial we will see how to read the ADC values on PIC18F4520 starter board.
Starter board comes with on board POT connected to ADC0, same POT value will be read and transmitted on UART at 9600 baudrate.

PIC18F4520 ADC pins

PIC18F4520 has inbuilt 8channel 10-bit ADC. Below tables shows the ADC pin mapping.

Adc Channel	PIC18F4520 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);
	}

view raw pic16f877a_ADC.c hosted with ❤ by GitHub

Demo