Multi Function Digital Meter Demo Circuit - 16F88

Generic Multi Function Meter

This project is about a build simple digital multi function meter using a PIC16F88 micro-controller and a 16x2 LCD display. The range of voltage can measured is 0 - 50V, but you can change it easily. This circuit, operation and below code was not tested and only simulated one using Proteus software. you can download full project files including MikroC source file and Proteus schematic. This is only a model of multi function meter and below code for educational purpose. but you can modify and used this code any time for your future projects.


/**************************************************************************

Multi Tester (V, I, F, R)
Copyright (C) 2015 Scorpionz

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.

>> Email: scorpionzblog@gmail.com
>> Blog : scopionz.blogspot.com

***************************************************************************/

int v_in, i_in, r_in;
unsigned f_in;

char *vin = "V=00.0v I=00.00A";
char *fin = "F=00,000Hz 00%";

void main()
{
OSCCON = 0x70; //8MHz
ANSEL = 0x07; // AN0, AN1
T1CON = 0x0A; //1:1
OPTION_REG = 0x80; //WPUB

TRISA = 0x07;
TRISB = 0x40;

PORTA = 0;
PORTB = 0;

Sound_Init(&PORTA, 6);
Lcd_Config(&PORTB, 0, 1, 7, 5, 4, 3, 2);
delay_ms(10);

Lcd_Cmd(LCD_CURSOR_OFF);

Lcd_Out(1, 3, ".:SCORPIONZ:.");
Lcd_Out(2, 1, "Lab Multi Tester");
delay_ms(2000);
Lcd_Cmd(Lcd_Clear);

while(1) {

TMR1H=0;
TMR1L=0;
T1CON.TMR1ON=1;
Delay_ms(1000); // Wait for 1 sec
T1CON.TMR1ON=0;

f_in = 256*TMR1H+TMR1L;
v_in = Adc_Read(0);
i_in = Adc_Read(1);
r_in = Adc_Read(2);

if(v_in>1020 || i_in>1000) PORTA.F3=0;
else PORTA.F3=1;

v_in = v_in/2.05;
vin[2] = (v_in/100)%10 + 48;
vin[3] = (v_in/10) %10 + 48;
vin[5] = (v_in%10) + 48;

i_in = i_in/.2;
vin[10] = (i_in/1000)%10+ 48;
vin[11] = (i_in/100) %10+ 48;
vin[13] = (i_in/10) %10+ 48;
vin[14] = (i_in%10) + 48;

fin[2] = (f_in/10000)%10+ 48;
fin[3] = (f_in/1000)%10 + 48;
fin[5] = (f_in/100) %10 + 48;
fin[6] = (f_in/10) %10 + 48;
fin[7] = (f_in%10) + 48;

r_in = r_in/.205;
r_in = (4790/r_in);
if(r_in) Sound_Play(r_in*30, 100);
fin[13] = (r_in/10) %10 + 48;
fin[14] = (r_in%10) + 48;

Lcd_Out(1,1,vin);
Lcd_Out(2,1,fin);
}
}

Multi Function Meter