Can you read the wall voltage using an EmonTx? I have an AC voltage sensor, but I don’t see an option in the code to read the voltage in real time.
My hoped for result is to be able to read the mains voltage at my house over time and log the variation.
Thanks in advance.
The rms voltage is indeed measured, and reported both by radio and via the FTDI serial interface as Vrms (lines 143 & 466 or thereabouts). The standard sketch’s reporting interval is 10 s, but you can edit the sketch to change that. However, emoncms.org will not accept inputs faster than every 10 s.