SMRTR TechAug 5, 2025TechEBlog

Sahko’s Custom-Built Futuristic Watch Has Retro-Tech Charm, Thanks to Flexible PCBs

SMRTR summary

Sahko's custom smartwatch uses 15 amber LED dot-matrix displays on a flexible PCB, creating a retro-tech look. It features salvaged vape batteries, an STM32U08 microcontroller, and displays time and animations. The watch has a short battery life and is expensive due to the displays. It includes an innovative 4-pin connector for clasping and charging, with buttons in the band for control.

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