Four Voltmeter In Single Hardware with PIC16F72 Microcontroller and 16*2 LCD

// Volt meter Test



// 10/03/2012 Friday


// Satya Ranjan Sarkar


// -----------------------------------------------------------------------------


//Display volt variable -------------------------------------------------------


unsigned int adc_volts1;


unsigned int volts1;


unsigned int adc_volts2;


unsigned int volts2;


unsigned int adc_volts3;


unsigned int volts3;


unsigned int adc_volts4;


unsigned int volts4;






char txt[8]; // used to display number string


//Display Name text variable ---------------------------------------------------


// wrap delay as a function call to save code size -----------------------------


void delay_500ms(void)


{


Delay_mS(500); // this value gives about 500ms per "pulse"


}


void main ()


{


TRISA = 0xFF; // All Input


TRISB = 0b00000000; // input & output


TRISC = 0b00000000; // All output






PORTB = 0x00; // PortB Clear


PORTC = 0x00; // PortC Clear






ADCON1=0X80; // all input are analog






delay_500ms(); // small delay for PSU to stabilise










Lcd_Init(&PORTB); // Initialize LCD connected to PORTB


Lcd_Cmd(Lcd_CLEAR); // Clear display


Lcd_Cmd(Lcd_CURSOR_OFF); // Turn cursor off


delay_500ms();


//Start loop here---------------------------------------------------------------


while(1)


{


adc_volts1 = ADC_Read(1); // read Batt Volt AD


delay_500ms();


volts1 = (adc_volts1 * 12); // 10 to 25 volts 12 to 30 volts 15 to 38 volts


wordtostr(volts1,txt); // format voltage int to text


txt[5] = txt[4]; // move 2 decimal places


txt[4] = txt[3];


txt[3] = '.'; // add dec point


txt[6] = 'V'; // add volts


txt[7] = 0; // and add NULL


Lcd_Out(1,1,txt); // display battery volt


delay_500ms();


adc_volts = ADC_Read(2); // read Batt Volt AD






delay_500ms();


volts2 = (adc_volts2 * 12); // 10 to 25 volts 12 to 30 volts 15 to 38 volts


wordtostr(volts2,txt); // format voltage int to text


txt[5] = txt[4]; // move 2 decimal places


txt[4] = txt[3];


txt[3] = '.'; // add dec point


txt[6] = 'V'; // add volts


txt[7] = 0; // and add NULL


Lcd_Out(1,8,txt); // display battery volt






delay_500ms();


adc_volts3 = ADC_Read(3); // read Batt Volt AD


delay_500ms();


volts3 = (adc_volts3 * 12); // 10 to 25 volts 12 to 30 volts 15 to 38 volts


wordtostr(volts3,txt); // format voltage int to text


txt[5] = txt[4]; // move 2 decimal places


txt[4] = txt[3];


txt[3] = '.'; // add dec point


txt[6] = 'V'; // add volts


txt[7] = 0; // and add NULL


Lcd_Out(2,1,txt); // display battery volt






delay_500ms();


adc_volts4 = ADC_Read(2); // read Batt Volt AD


delay_500ms();


volts4 = (adc_volts4 * 12); // 10 to 25 volts 12 to 30 volts 15 to 38 volts


wordtostr(volts4,txt); // format voltage int to text


txt[5] = txt[4]; // move 2 decimal places


txt[4] = txt[3];


txt[3] = '.'; // add dec point


txt[6] = 'V'; // add volts


txt[7] = 0; // and add NULL


Lcd_Out(2,8,txt); // display battery volt


}


}