ESP8266 development boards like the Wemos D1 Mini and NodeMCU are an excellent ... His 3D printed design uses pogo pins to securely connect to the board’s castellated edges, which also holds ...

You have an ESP8266 board like the Wemos D1, a Li-Ion battery, you want to build a small battery-powered sensor that wakes up every few minutes to do something, and you don’t want to delve into ...