[image] EmonPi Temperature Measurement We got our SMT32 up and running today using an emontx shield. Very easy to upload to using PlatformIO or Arduino IDE. This is a topic for a different conversation! This is great to hear! I see from the repo that you are using a NUCLEO-F401RE development …

[image] dBC: that it works with a stock shield (no jumper required). You could potentially even productise that and sell more shields. Adding the jumper and using a shield are just means to basic tests on it, we would want more than 4 cts and 1ac. I personally need 3ac’s and 5ct’s per phas…

Yes, fair point. The 1V+4CT shield is just an interim prototype board.

OK, I completed the ADC trigger delay stuff, even if it ends up not being used it might be useful for playing around or calibration. It now supports: +ve lags (Current ADCs are launched early, Voltage ADC is launched late) -ve lags (Voltage ADC is launched early, Current ADCs are launched late) …

Paul in this thread you pointed out that STMDuino now gives support for the STM32 chips in the Arduino environment → Best hardware option for multiple CTs & WiFi - #24 by fahrvergnuugen It would be great if the code you guys are working on could be made into an Arduino library - say, CT-STM32 or ST…

[image] Bramco: Also just want to say this has been one of the most interesting, informative threads for a long time. I’ll drink to that. It’s the first thing I read after logging on! :grin:

For info, this is the latest version (v5) of dBC’s txsheild_demo_5.tar.gz, which as can be seen, now captures & prints CPU temperature and Vdda (the analogue reference voltage). The readings are obviously wrong as I’ve just hooked it up with no CT’s or AC input into the shield at the moment, just f…

Those Irms values look very good… almost too good to be true. Do they ever change at all? I’m assuming that’s the mid-rail? I’m not quite sure what to make of Vrms but it looks pretty solid too. I struggle with headphone jack schematics. Can someone advise what the expected behaviour is when no…

[image] dBC: Do they ever change at all? No, the Irms is always a steady 2047.88 The Vrms is very changeable - I assume just noise because it’s not connected. I need to get another set of CT’s and an AC/AC power adapter, then hopefully I’ll get some meaningful readings. Paul

[image] Paul: No, the Irms is always a steady 2047.88 hmmm… I hope that’s not a bug :frowning: Is the shield plugged into the Nucleo, or are the Nucleo inputs totally floating?

[image] dBC: I’m assuming that’s the mid-rail? That’s what I thought too. However here’s a schematic [image] thinking that was a typo, I’ve buzzed out a pcb and found it is correct. The wrong side of the CT/burden gets grounded, so instead of the expected behavior it is grounding the mid-…