3 digits Digital volt meter

Posted on Feb 5, 2014

This is simple 3-digits digital volt meter. PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply to mesasure DC currant with parallel Rshunt but I`m not descript here. As we know the most of PIC microcontroller has 8-bit/10-bit on-chip Analog to Digital converter module. In this project I use PIC16

3 digits Digital volt meter
Click here to download the full size of the above Circuit.

F676 which have ADC 10-bits 8 channel but this project use only one channel for measure voltage input for other pin set as digital I/O. From the schematic above the input voltage divided by R1 and R2 (voltage divider). VR1 parallel with R2 use to adjust appropriate display full scale voltage. The divided input voltage will connected to AN3(RA4) which set as analog input.

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