Read the full post here: https://westsideelectronics.com/breathedot-2/

I finally came around to updating the original BreatheDot design. The interface was a little challenging to use and it didn't last very long.

Upgrading the Breathedot to use an STM32 really improved the quality of life for me as the designer and programmer, and it offers a better interface. Now the whole PCB can be used as a button, and it goes into sleep mode, allowing for the battery to last years on daily usage.