The project consists of a relay board controlled by an ESP8266-packing Adafruit Huzzah. It’s all powered by a 9V power supply with a regulator supplying the relay coil and Huzzah with 5V.

By connecting a MP1584EN DC-DC converter and ESP8266 to this connector, it’s possible to send commands directly to the hardware. Add a little glue code to combine this capability with a library ...

Get the Spreadsheet ID from the URL. Delete all of the default text in the script editor, and paste the GoogleScripts-example.gs code. Update the Spreadsheet ID (line 9) with the ID obtained in step 3 ...

The board uses these values to calculate the power consumption and can send the data to Adafruit IO MQTT service via a Wi-Fi connection. It's important to note that working with high voltage circuits ...

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