I’ve just finished building an emonTX shield (v1) that I bought a number of years ago. I’ve flashed the Arduino with the “Shield_CT1234_Voltage” firmware over at https://github.com/openenergymonitor/emontx-shield
I’m replacing an emonTX, which has been working great for years, as I need an extra channel.
However, when I plug in the AC & 5V power supplies to calibrate the setup, the voltage measured is way too high (around 290V IIRC), while the digi-meter is measuring an actual 239V.
Something tells me I’m running the wrong firmware maybe? Looking at the schematics the board seems to have changed a little, with extra resistors maybe (but it was late last night when I was looking at this).
I double checked the build which seems correct. So I guess I’m after the V1 firmware to go with the V1 board (before the SMT/reversing too place)?