I have Autotransformer which output 0-250 v and i want to read Ac Voltage by arduino but how to read accurately

[image] mdali91: accurately How accurately? +/-1V, +/-0.5V, +/-0.1V? Be careful what you ask for since more accuracy means more money.

This is a real cheap solution [image] Grove AC voltage sensor for a DIY Smart Energy Meter Electrical energy is crucial in our lives, and it is very important to know how we use it in order to be aware of how to do it prudently. By Christopher Mendez Martinez. …

That would be +/- 0.04 % error. It will take me several days to come up with a circuit that can measure RMS voltage that accurately. It would require a custom PCB

Yes but I have no idea about the accuracy but probably not 0.04%

Many people use an AC transformer with Arduino to safely reduce the 250 VAC to a reasonable value, as described here: https://docs.openenergymonitor.org/electricity-monitoring/voltage-sensing/index.html

Have a look at multimeter specifications to see what is reasonable , a typical fluke is around 1% of reading on AC volts . Have a look at voltage transducers with a 0-5v DC output

First, you need to isolate yourself, the Arduino, and your computer if you plug-in USB, from the lethal voltages! ...Hand-held multimeters are obviously isolated (battery operated and enclosed in plastic) and AC powered multimeters have isolated power supplies (i.e. The black lead isn't "ground".) …

How to measure 0-250 ac voltage using arduino with op amp

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sterretje February 1, 2024, 11:20am 2

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Zmpt101b problem with measure ac voltage

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How to measure 0-250 ac voltage using arduino with op amp

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