I stumbled over the iotawatt project by chance during my own little research about power metering.
An iotawatt would probably solve my task at once. I have been tinkering with esp2866, A/D converters like Ads1115 and inductive sensors for a while and have actually written my own ESP firmware to get an RMS value of what the inductive sensor sees. this works fine already on the breadboard. Also I just need three channels for a start, not 14.
The only missing piece of the puzzle is a voltage reference to get the U/I phase to be able to read real power values. And the software to do this.
Do you think I can use the iotawatt reference adapter and get something working, or are there probably a hundred corner issues lurking that iotawatt has already solved and trying to reinvent the wheel is a waste of time? Are the ads1115 sensors a sensible choice?
My main objective is of course trying to save some money because I have most of the required (or similar) hardware already, but I also want to learn a bit in the way.
What do you think? Make or buy?