/* Project: Digital Voltmeter based on PIC16F877
Oscillator * 4MHz, MCLR Enabled, PWRT Enabled, WDT OFF
 
*/ 
// LCD module connections
sbit LCD_RS at RB0_bit;
sbit LCD_EN at RB1_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
sbit LCD_RS_Direction at TRISB0_bit;
sbit LCD_EN_Direction at TRISB1_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections
char Message1[] = "DVM Project";
unsigned int ADC_Value, DisplayVolt;
char *volt = "00.0";
void main() {
ADCON0 = 0 ; // Analog channel select * AN0
ADCON1 = 0b00001110 ; // RA0/AN0 is analog input
 
TRISB = 0b00000000; // PORTB All Outputs
TRISA = 0b00000001; // PORTA All Outputs, Except RA0 
Lcd_Init();        // Initialize LCD
Lcd_Cmd(_LCD_CLEAR);      // CLEAR display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
Lcd_Out(1,1,Message1);
Lcd_Chr(2,10,'V'); do {
 ADC_Value = ADC_Read(0);
 DisplayVolt = ADC_Value * 2;
 volt[0] = DisplayVolt/1000 + 48;
 volt[1] = (DisplayVolt/100)%10 + 48;
 volt[3] = (DisplayVolt/10)%10 + 48;
 Lcd_Out(2,5,volt);
 delay_ms(500);   // Hold for 500 ms
} while(1);} // End main()