The Pine Time is a $27 smart watch that runs open source firmware. I’ve had one sitting in the back of a drawer for a year or two. When I saw @steveruizok ’s Tweet about hacking on ESP32 devices with Claude, I found some inspiration to pull my PineTime out of the drawer and see what Claude might be capable of!

if you know what a "coding agent" is then go buy this or something very similar (not sponsored but they're on amazon, pi hut, ali, all over) pic.twitter.com/iPvHxBiltf

— Steve Ruiz (@steveruizok) July 25, 2026

I knew I wanted to start by building a watch face because the default watch faces that come with the watch are pretty plain and boring. I’d also recently seen @levelsio ’s Tweet about building a custom Casio watch face for is Apple Watch.

I wondered if I could build something similar for the PineTime (with a little help from Claude).…