TL; DR
- An open source project called LightInk could put an ultra-efficient E-Ink screen on your wrist.
- The watch reportedly only uses ~0.5mAh per day, which equates to about 40 days of battery life in typical use.
- It’s also solar-powered and aggressively optimized for “infinite” runtime under the right conditions.
E-ink it already makes a lot of sense to read and now someone makes a strong case for wearing it. a new open source project called LightInk E-Ink turns the panel into a minimalist wristwatch that catches the eye and delivers battery life beyond what most wearables can offer.
At the heart of the device is an inexpensive microcontroller ESP32, known for its Wi-Fi support and ultra-low power consumption sleep modes. It is paired with a small E-Ink display similar to the panels used in compact DIY e-readers (including mounts). we’ve got you covered before). Unlike OLED or LCD screens, E-Ink only draws power when the image changes, making it ideal for viewable data such as the time or basic statistics.
LightInk is designed to prevent the ESP32 from fully waking up whenever possible, instead relying on ultra-low power modes that execute quickly and then go back to sleep. The result is a power consumption of about 0.5 mAh per day. With a 20 mAh battery, it provides about 40 days of operation time on a single charge. There’s also solar support, so under the right conditions, the device can charge itself faster than it drains. In other words, there is the potential for infinite runtime.
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Despite the extreme focus on efficiency, the watch supports functions such as LED light, vibration motor, speaker, GPS and even LoRa communication, although the developer notes that this is a significant energy consumption and is intended for occasional use. This is alongside more typical smartwatch features such as touch controls and customizable alarms, although some elements are still in development. For now, there’s a surprising amount of environmental data, including sunrise and sunset times and moon phases.
Of course, it’s not a polished alternative to something like the Google Pixel Watch. This is a DIY project with files and instructions available on GitHub. Features are limited and the experience is deliberately stripped down, but the battery optimization alone makes a compelling case. It’s also a reminder of how far E-Ink can go beyond tablets.
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