[publidave] wanted a simple wireless display for a bluetooth cycling cadence sensor, and soon found himself deep down the rabbit hole of Micropython and Bluetooth Low Energy on the ESP32.

It shares the same Seeed Studio XIAO ESP32-C3 microcontroller, 0.49 inch OLED display, and tiny 40 mAh LiPo battery. The only thing that’s really changed, aside from the adjustments necessary ...

But this model is powered by a modern, low-power ESP32-S3 processor ... also added a tiny OLED screen and come up with a hybrid typing system: the little OLED screen will display characters ...