Hi, I live in South Africa and wanted to implement a power monitoring solution, and came across this site. Locally I cant find anyone that stocks any of the products in your shop (Closest being a rpi3 hat: PiShop - but the cost for this hat seems excessive) I have just about all the components nee…

Pretty much! You will find many software on this project that do what you want either as they are or with some tweaking. All the code and hardware designs are open source and available (somewhere or other) to use. The emonESP is an esp8266 based serial to wifi bridge with both http and mqtt capabi…

Thanks, Will start by setting up EmonCMS on my laptop first and play around with different sensors/arduino/ESP8266. I see you use a 9v AC-AC adapter on the learn section, can I use a 6v AC-AC instead?

[image] Caz: can I use a 6v AC-AC instead? As long as it is a linear transformer rather than a switched mode PSU and you adjust the voltage divider resister (and calibration) values accordingly, I don’t see why not. Of course we can’t speak for the quality of the unit you have, not even all …

Thanks, Will see if I can get a 9V AC transformer first. I was planning on building my own little shield for an Arduino Nano. I want to measure the transformer voltage, and in parallel build a dc regulator circuit to power the arduino and esp with the same transformer. Will this interfere with the…

[image] Caz: Will this interfere with the voltage measurements? Should I be using 2 transformers? In short, yes and yes. Using the same transformer to perform both functions tends to distort the sample waveform. Something you’ll want to avoid, if possible. If you ensure the transformer is l…

What about using something like this PCB MOUNT ENCAPSULATED TRANSFORMER for measuring the voltage?

That one has a primary voltage rating of 386 Volts. Had you noticed that?

Plus, from experience those are designed down to size and not up to quality, so the waveform of ones we’ve looked at is very distorted, hence you introduce measurement errors. For what you need for measuring the a.c. waveform, fidelity of the wave shape is important.

Ok, so best to get a AC-AC wall adapter then and stay away from PCB mount transformers?

If you have the ability to fully test one and it turns out OK, then that’s fine. But our experience is, many are not. And by “fully test”, I mean for harmonic distortion and phase errors.

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