![]() Samiuddhin, a circuit designer, is B.Tech in electrical and electronics engineering. There may be a small tolerance (deviation) in the readings due to parasitic elements in the PCB. ![]() Do not try to measure negative voltages, or reverse the polarity of the cable, as it would destroy the Arduino. Note.This circuit measures only low voltages of 1mV to 1V. People say that is is a clone of this or that other companys meter but the schematics do not agree with what I see in my meter. Getting a good schematic for the unit that I have has proved to be impossible. Use test probes for better accuracy and low attenuation. I have a Tenma AC millivoltmeter that has parts marked with logic gate part numbers and likewise seems to have no digital circuitry. After uploading the source code (mV_Meter.ino) to Board1, connect it to LCD1. The Arduino can be powered by an external 9V battery or a 9V, 500mA adaptor. You can assemble the circuit on a PCB or breadboard. It includes a 16MHz crystal, USB connector, power jack, and ICSP header and comes with pre-loaded Arduino bootloader in its ATmega328P chip. It has fourteen digital input/output (I/O) pins, six of which can be used as PWM outputs and six as analogue inputs. If it does, ‘Over range’ alert message is displayed on LCD1.Īrduino Uno is a popular open source microcontroller development board based on ATmega328P microcontroller. The voltage at analogue pin A0 should not exceed 1V. ![]() The Arduino is the brain of the circuit that calculates the voltage based on the ADC value using the program, which is displayed on LCD1.
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