How to Build a Smartwatch: Picking a Chip

[ 2025-05-12 ] Full video of this post is up on my podcast on YouTube! Subscribe on PocketCasts, Spotify, or Apple Podcasts. TLDR: We've selected a chip for Core Time 2 - SF32LB52J. It’s from a company called SiFli, and features an open source SDK. I’m writing a series of posts on how to make a smartwatch Covering how to pick a chip (today), other hardware and software stuff (later) I hope others will use PebbleOS to build interesting new smartwatches and other devices! This is the first in a series of posts around the steps you need to take in order to build a smartwatch. I want to show that it's not actually that hard to make a decent one in 2025! Hopefully the work that we're doing to make these new watches will help other folks to build some as well. Smartwatches are not and should not be ‘one-size fits all’ devices. I really hope that the open sourcing of PebbleOS might spark someone’s imagination and enable them to build a smartwatch that fits their needs perfectly! A sm ... Read full article.