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Battery voltage monitor with NodeMCU Esp8266-12E WiFi module
Supercapacitor as temporary backup connected to Vin and GND of NodeMCU? : r/ esp8266
Adapter For Nodemcu Usb 32m Esp8266 Esp-12e Esp-12f Cp2102 Internet Wifi Module Dc Power Of 4 ~ 9v Vin Pin New Arrival - Instrument Parts & Accessories - AliExpress