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Ac millivoltmeter schematic8/30/2023 ![]() ![]() ** Note: Do connect ground pin of Arduino to the point as shown in the figure or circuit will not work.Īs we are using 220/12 v transformer, we get 12 v on l.v side. Connect a wire from n-terminal of diode to the analog pin A0 of Arduino.Connect capacitor and zener diode across 4.7k.Connect 10k resistor in series with 4.7k resistor but make sure to take voltage as input across 4.7k resistor.Connect high voltage side(220V) of transformer to the mains supply and low voltage(12v) to the voltage divider circuit.0-25V Digital Voltmeter using AVR MicrocontrollerĬircuit Diagram for this Arduino Voltmeter is shown above.Simple Digital Voltmeter Circuit with PCB using ICL7107.Here are some Digital Voltmeter Projects: ![]() whereas in case of digital voltmeter you can just use a LCD or LED matrix or even your laptop (as in this case) to print the voltage values for you. Making a Digital Voltmeter is a lot easy than making an analog one because in case of analog voltmeter you must have good knowledge of physical parameters like torque, friction losses etc. We are going to print that voltage on serial monitor of Arduino IDE as well as show on the multimeter. In this project, we are going to make an AC Voltage Measuring Device using Arduino, which will measure the voltage of Alternating Current Supply at our home. ![]()
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