Hey all. First time poster.
I’ve read through all the installation procedures for making an arduino version of the openenergymonitor using the emonLib for the Arduino. I have gotten 2 SCT-013-000 probes and have them working properly.
Now I want to measure the voltage of the mains so that I can get an accurate read on the wattage usage. This is where I am super confused. In the Guide is talks about using a wall wart. I have plenty of these little things laying around. However, I am completely confused as to how to use one of these things to measure voltage. In the Guide, the schematic shows a transformer, but talks about the wall wart. Do I take the transformer out of the wall wart and use the resistors mentioned in the article, or do I connect up directly the output leads of the wall wart?
I’ve done searches here in the forum, and on Google. And all I get back is people who are still clueless, or pages where using the wall wart to power to the arduino, or to use it as a cheap ac->dc converter for other projects. I can’t find to use it as a metering device.
Any help is greatly appreciated.
PS I hope I put this in the correct section.