How to make an Arduino Voltmeter. As you may well know, Arduino’s analog inputs can be used to measure DC voltage between 0 and 5V (when using the standard 5V analog reference voltage) and this range ...

Follow our schematic diagram for building a 10-volt power supply from the 7810 voltage regulator. Wire the two 9-volt-battery holders together in series by soldering a black wire from one holder ...