Arduino Voltmeter with LCD and 4 Channels

This Arduino voltmeter measures four independent voltages and displays the results on a liquid crystal display (LCD). Each channel can measure up to about 50V DC which is achieved by adding a voltage divider to each channel. Click the above link for more details, a circuit diagram and Arduino sketch code.

Measuring Voltage using an Arduino Uno

How can one measure or monitor voltages greater than 5V using an Arduino board? The easiest way is to use a voltage divider network — which consists of only two resistors as shown in the circuit diagram below.

A full article on the subject is available with more information, code (an Arduino sketch) and some precautions that need to be taken into consideration.

Arduino Voltmeter Circuit

Arduino Voltmeter Circuit