ChronoHackers
The Most Accurate Watch On Your Wrist Has No Display At All
Sean Hodgins built a GPS-disciplined PPS timing reference into a wrist-worn form factor — no microcontroller, no firmware, no time display, just a u-blox GPS module driving BNC outputs through hardware logic buffers.
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The Ollee Watch team has shared a roadmap for the rest of 2026, with a Q2 firmware update due this week and three major features — notifications, activity tracking, and third-party apps via a new platform called Ollee Forge — planned for the year.
A fully 3D-printed watch case built around an off-the-shelf Miyota 8N24 movement, using a twist-lock bayonet back instead of fussy threads.
Designer Daniel Idle built a sterling-silver-plated signet ring with a mini OLED display embedded in the face, looping the green falling-code animation from The Matrix.
A replacement PCB and firmware fork turns a stock Casio G-Shock DW-5600 into a fully programmable, open-hardware watch.
A drop-in mainboard replacement gives the classic Casio F-91W and A158W Bluetooth syncing, step counting, heart rate, and built-in games while keeping the original case, LCD, and feel.
Saksham Bhutani reverse-engineered a cheap Bluetooth smart ring's BLE protocol and built a SwiftUI iOS app that pairs the raw sensor data with an on-device AI coach, no subscription or cloud account required.
A limited 200-piece kit swaps the Casioak's resin case for full stainless steel with a sapphire crystal and ceramic bezel insert, without touching the watch's electronics.
Daniel Ansorregui's ESP32 smartwatch pairs a built-in solar panel with e-paper and a clever RTC-memory boot trick to stretch run time to months.
What ChronoHackers is, why it exists, and what you will find here
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