Cyberpunk DIY Watch Uses Flexible PCB and Wraparound Displays

Key Takeaways

• Flexible PCB with wrap‑around high‑brightness displays.
• Reused vape batteries cut costs, added sustainability.
• STM32 microcontroller improved performance over Raspberry Pi Pico.
• Low‑temp solder and stiffener layer solved heat and flex issues.
• Open‑source schematics invite community experimentation.

Summary

Sahko unveiled a cyber‑punk‑styled DIY smartwatch at the Open Sauce event, featuring a flexible printed circuit board and wrap‑around high‑brightness displays. The watch uses salvaged disposable vape batteries and an STM32 microcontroller to deliver custom animations and menus while keeping costs low. Engineering challenges such as heat‑sensitive displays, power‑supply instability, and PCB flex were mitigated with low‑temperature solder and a stiffener layer. Although not commercially viable due to component cost and fragility, the project is fully open source, encouraging further experimentation.

Pulse Analysis

The DIY wearable scene has accelerated as maker festivals and open‑source platforms lower barriers to entry. Flexible printed circuit boards, once confined to high‑volume consumer products, are now accessible to hobbyists, enabling form‑factors like wrap‑around displays that would be impractical on rigid substrates. By pairing these boards with bright OLED panels, creators can achieve the neon‑lit aesthetics popularized by cyber‑punk media while maintaining readability in daylight.

Sahko’s implementation showcases several engineering shortcuts that address the inherent fragility of flexible electronics. Replacing a Raspberry Pi Pico with an STM32 microcontroller reduced power draw and unlocked smoother animation pipelines, while low‑temperature solder prevented thermal damage to the delicate screens. Adding a polymer stiffener behind the PCB restored structural integrity, mitigating the risk of connector fatigue during wrist movement. These tactics illustrate how incremental hardware tweaks can resolve the classic trade‑off between visual impact and reliability.

Beyond the hardware, the project’s open‑source release fuels collaborative iteration across the maker community. Free access to schematics and firmware invites developers to experiment with alternative power sources, sensor integrations, or even mass‑production adaptations. Although the $420 display cost and fragile assembly preclude immediate commercial scaling, the watch serves as a proof‑of‑concept for sustainable, high‑design wearables. As component prices fall and flexible manufacturing matures, the lessons from this cyber‑punk prototype could inform the next generation of niche smart accessories.