ADC vs Analog Voltage Displaying with PIC18F4550 in CCS PICC

In previous posts, I have shown about using the ADC module of PIC18F4550 programming, and LCD programming interface in CCS PICC. 

In this post, I use PIC18F4550 to read two analog input channels. A character LCD as used in the previous post displays the value of ADC reading of each channel and its analog voltage value. However, here I use the full 10-bit ADC resolution of this device.

x2

x1.5

x1

x0.5

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ADC reading and its value displaying

Source code from GitHub gist:

	#include<18f4550.h>
	#device ADC=10
	/*Use high speed clock no PLL prescaler
	no system clock post scaler */
	#fuses HS,PLL1,CPUDIV1
	#use delay(clock=20M)
	#define LCD_ENABLE_PIN PIN_B2
	#define LCD_RS_PIN PIN_B0
	#define LCD_RW_PIN PIN_B1
	#define LCD_DATA4 PIN_B4
	#define LCD_DATA5 PIN_B5
	#define LCD_DATA6 PIN_B6
	#define LCD_DATA7 PIN_B7
	#include<lcd.c>
	void adcConfig(void){
	//RA0 AND RA1 As Input
	set_tris_a(0x03);
	//PORTD as output
	set_tris_d(0x00);
	//Set RA0 To Analog
	setup_adc_ports(AN0_TO_AN1);
	//Select ADC internal RC Clock
	setup_adc(ADC_CLOCK_INTERNAL);
	}
	int16 getAnalog(char channel){
	set_adc_channel(channel);
	delay_ms(1);
	int16 analogValue=read_adc();
	while(!adc_done());
	return analogValue;
	}
	void main(){
	float voltage;
	int16 adcValue;
	lcd_init();
	adcConfig();
	while(1){
	lcd_gotoxy(1,1);
	adcValue=getAnalog(0);
	voltage=(adcValue*5.0)/1024;
	printf(LCD_PUTC,"AN0: %Lu %.2fV ",adcValue,voltage);
	lcd_gotoxy(1,2);
	adcValue=getAnalog(1);
	voltage=(adcValue*5.0)/1024;
	printf(LCD_PUTC,"AN1: %Lu %.2fV ",adcValue,voltage);
	delay_ms(500);
	}
	}

view raw adcLcd.c hosted with ❤ by GitHub

Click here to download zip file of this example.

Schematic Diagram