This is a project to report the whole house electricity use via a web page. See FridgeMonitor.

Bought:

• SCT-013-000 Non-invasive AC Current Sensor Split Core Transformer 100A ​Amazon
• NodeMCU ESP8266 module
• Cheezy Arduino rip-off ("Elegoo")

Installed the power monitor library from openenergymonitor.org. Hooked up to sensor with 33 ohm load resistor and wrote a bit of code. Tested with 100W incandescent bulb and seems to work OK.

Rearranged wiring a bit in the electric panel so two of these sensors can fit on the main feed wires.

Built firmware for Arduino to output one measurement per second on A4/A5 using software serial at 115200. ESP8266 can access this using it's port... tested using the telnet/serial bridge on WiFi?.