6-channel Energy Monitor https://github.com/CircuitSetup/Expandable-6-Channel-ESP32-Energy-Meter ESP32 3-channel Power logger https://hackaday.io/project/187504-esp32-3-channel-power-logger https://www.elektormagazine.com/labs/140409-power-meter https://openenergymonitor.org/ https://hackaday.io/project/191761-pwrtool-500-featuring-the-flip-c3 https://github.com/kscholty/SmartS..