Serial Voltmeter

I built this serial voltmeter a few years ago and now use it to measure the voltage of my solar system every five minutes. See the current voltage and daily graph.

Design and Software

The following shows how to use an analog to digital converter to measure voltages and transmit the data to a computer's serial port.

Basic design revised from
Serial port reference information from
Datasheets for the ICs


Last modified: July 17, 2009