It runs on a Wemos D1 mini and uses a small stepper motor to push a 3D-printed finger along a rack-and-pinion actuator. Since the Yubikey requires capacitive touch, [Bert] added a screw to the ...

As the pictures show, what I actually received was a bunch of assorted cheapo D1 Wi-Fi boards. So presumably, some Chinese makers still makes the generic D1 Wi-Fi modules – perhaps both R1 and R2 ...

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 ...