NEW GUIDE: Build a Cloud-Connected ESP8266 Power Meter
https://learn.adafruit.com/build-a-cloud-connected-esp8266-power-meter/
Controlling the electrical consumption in your home is one of the most important thing you can do, both because of environmental concerns & to reduce the electricity bill at the end of the month. There are countless of electrical power meters out there, but in this guide, I’ll show you how to build your own, and to use the ESP8266 feather board to measure how much power a single device is using. Note that this guide is about measuring power for DC (Direct Current) devices only.
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https://learn.adafruit.com/build-a-cloud-connected-esp8266-power-meter/
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