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The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack.

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I have main device with a 3.3V serial port that has not enough power for the connected ESP. Main device powered by a single LiPo-cell. I want to power on the ESP (3.3) when the main device is powered …
asked Feb 3 '18 by Raphael
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I have a project where I need to switch the + side coming from the battery (single cell LiPo) to a consumer (ESP8266) with a 3.3V signal (common ground). I have loads of NPN and PNP-transistors here …
asked Feb 11 '18 by Raphael