Daniel designs LightInk Watch with solar ePaper for infinite battery life

7 articles · Updated · Hackster.io · Apr 24

The LightInk Watch uses an ESP32-PICO-D4 microcontroller, LoRa radio, and a 1.54-inch ePaper display, achieving up to nine months of battery life in real-world testing.
Daniel optimized power consumption by using a wake-up stub for RTC code, reducing boot and display update time to under 1ms, and incorporated a compact solar panel for continuous charging.
Originally inspired by limitations in existing smartwatches, Daniel’s open-source project continues to evolve, with hardware and code available on GitHub and further updates shared on Hackaday.io.

Is 'infinite battery' worth sacrificing the features that make modern smartwatches 'smart'?

How does Lightink's custom code bypass its microcontroller's boot process to achieve extreme energy efficiency?

What is the practical communication range of Lightink's LoRa feature in real-world off-grid scenarios?

With materials now turning body heat into power, is solar already an outdated path to infinite battery life?

Could a network of LoRa devices like Lightink create resilient, community-owned communication grids for smart cities?