pic16f688 based digital voltmeter

Posted on Feb 4, 2014

Actually this is the another version of my older DVM project that was based on PIC12F683. The older version displays the measured voltage on a LCD that is driven serially by PIC12F683 using 3 I/O pins. The new one uses PIC16F688 microcontroller that doesn`t require the serial driver as it has got enough pins to drive a LCD directly in 4-bit mode.

pic16f688 based digital voltmeter
Click here to download the full size of the above Circuit.

The theory and math is just the same. You can read my PIC12F683 version of this project here. Important: You need a regulated +5V supply for accuracy of the output. The ADC uses Vdd as the reference for conversion, and all computations are done with Vdd = 5V. You can get a regulated +5V using a LM7805 linear regulator IC.

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