Good afternoon all, So I want to make a voltmeter using Arduino UNO. whenever i use the internal voltage source (The 5V and 3.3V ) it gives me a kind of correct answer but whenever i use an external voltage source, ie a battery or a dc generator it gives me the max analog value (1023). I am using …

DC Voltmeter {HELP!}

AminBazyan November 17, 2017, 3:32pm 3

Thank you sir! I have figured it out! I didn't connect the R2 to the Arduino's GND...

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