E-paper has been around for quite a few years now, and has been most famously used in e-readers and the odd smartwatch. If you’d like an understated timepiece that doesn’t emit a glow itself, it’d be hard to beat the e-paper-based Agora clock.
This device is part of the Agora Watch Project, described as an “open source, open hardware platform for wrist watch and table watch with e-paper displays.” The project uses an Atmega328 processor to power its black and white screen, and more hardware info is found here.
A neat feature of this clock, and e-paper in general, is nicely illustrated below, where it’s shown as clearly visible in a variety of lighting conditions. Granted, you won’t be able to read it during total darkness, but at least you don’t have to endure red light attempting to penetrate your eyelids while sleeping!
For another take on e-paper displays, be sure to check out the Papyr BLE module discussed here. It displays photos and doodles from your phone in not just black and white, but red as well!
