Build Your Own Voltmeter Using Arduino
Voltmeters are not that expensive , but it’s always more fun to create your own devices. YouTube DIYer Educ8s builds a cheap voltmeter for less than $ 10 using an Arduino and a voltage sensor.
A multimeter that measures voltage is one of those gadgets that every electronics master should have, but sometimes the key to understanding how to use a device is to make one yourself. In this case, you just need to connect a few cables together, set up the Arduino, and start measuring all the voltage you might want. This is also pretty accurate, but the most interesting thing is to find out how it all works. Go to YouTube for a guide.
Arduino Project: DIY Voltmeter | Youtube