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This tag is for questions regarding powering and/or power consumption of Arduino systems.

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For one of my projects I use the SparkFun ESP8266 board with an additional LiPo battery in cases power supply goes down. Now I would like to communicate the power loss - or the fact that the board … is running on battery power via WiFi. Is there a way to find out (in code) when the board switches from mains power to battery and back? …
asked Nov 13 '17 by Drejc