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Problem to measure AC voltage using CT with Industruino IND.I/O D21G

Good morning,

My purpose is to know the value of an AC current in my house (230V Ac).
To do that, I use a Current Transformer (CT) and I would like measuring the RMS voltage with the CT. My CT can measuring a 10A current (0-1V output).
I watched the articule (https://industruino.com/blog/our-news-1/post/proto-power-meter-20) but that works with PROTO D21G not with IND.I/O D21G.Anybody can help me?

Thanks a lot.

Olivier

Olive Bai
Olive Bai
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Asked on 4/24/21, 8:50 AM
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Thanks for your reply Tom.

Regards

Olive Bai
Olive Bai
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Answered on 4/26/21, 11:09 AM
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Hi,

The INDIO's ADC is not as fast as the MCU's built-in ADC, the docs mention max 240sps at 12-bit resolution. You want to analyse a 50Hz signal so ideally you would want to sample at a much higher rate.

You can visualise this with a simple sketch, measuring the analog channel, and printing the value to the Serial Monitor, and using the Arduino IDE's Serial Plotter to draw the data points.

Note that you are dealing with AC signal, so you'll have to use a DC bias to bring the signal into the positive range.

It is not so easy to analyse the signal, you can have a look at this library https://github.com/openenergymonitor/EmonLib

Tom
Tom
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Answered on 4/25/21, 11:55 PM
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Asked: 4/24/21, 8:50 AM
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Last updated: 4/26/21, 11:09 AM