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Topic: How can I measure AC voltage in the range 0-250 VA (Read 13 times) previous topic - next topic


How can I use the Arduino to measure a variable AC voltage? The range would be 0-250 VAC.


You probably need to make a circuit to reduce the 0-250vac to 0-5vdc, and probably would be good to incorporate some type of electrical isolation depending on the useage.
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)


Any idea where I can find the circuit that would do the voltage reduction and ac/dc conversion?


Aug 13, 2010, 04:48 am Last Edit: Aug 13, 2010, 05:21 am by prs09210 Reason: 1
Is the 250V RMS?

Isolated transformer. Bridge rectifier. Capacitor. Voltage divider for the rest?

Here's my take:

You could use a multi-tap transformer so you can have selectable ranges for better accuracy...


DMM with serial interface:


Accurate measurement, no isolation/safety problems, no hardware development.

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