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
Temp. And Humidity Sensor With A CR2032 For Over 1 Year! - Hackster.io
Particle Matter Battery Sensor - Low Power Air Quality Sensor Arduino – RAKwireless Store
Battery-Powered ESP8266 Sensor? Never Been Simpler | Hackaday
How to Make a Wireless Sensor Live for a Year on One Tiny Coin Cell Battery
Temperature Sensor Interfacing With Arduino Project – Connection & Code
TIDA-00374 reference design | TI.com
IoT weather station with Seeed Studio | by Leonardo Cavagnis | Medium
Simple BLE Temp Sensor for Beginners, 5 Yrs on Coin Cell : 8 Steps - Instructables