![I recently finished the prototype for a battery powered ESP8266 based temperature and humidity sensor with eInk display. Currently working on a custom PCB. : r/arduino I recently finished the prototype for a battery powered ESP8266 based temperature and humidity sensor with eInk display. Currently working on a custom PCB. : r/arduino](https://i.redd.it/q0c5386r08p61.jpg)
I recently finished the prototype for a battery powered ESP8266 based temperature and humidity sensor with eInk display. Currently working on a custom PCB. : r/arduino
![boost - NodeMCU power via battery + battery charger + booster - Electrical Engineering Stack Exchange boost - NodeMCU power via battery + battery charger + booster - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/DxNgI.png)
boost - NodeMCU power via battery + battery charger + booster - Electrical Engineering Stack Exchange
![Just my battery operated ESP8266 enviro sensor node with OTA update - Projects made with Blynk - Blynk Community Just my battery operated ESP8266 enviro sensor node with OTA update - Projects made with Blynk - Blynk Community](https://community.blynk.cc/uploads/default/original/2X/4/48347c68577b871eab321a42afc6b75ca1d31ed5.png)