Low Power Challenge: E-Paper Shelf Label Becomes Ultra-Frugal Clock

In excess of the earlier two many years, e-paper has advanced from an exotic and pricey show technological know-how to some thing inexpensive plenty of to be employed for supermarket value tags. While this sort of electronic shelf labels are now simple to discover, basically re-employing them is frequently difficult because of to a deficiency of documentation. Luckily for us, [Aaron Christophel] has managed to reverse engineer lots of kinds of shelf labels, and he’s demonstrated the success by turning a person into an ultra-reduced-electricity clock termed Triink. It’s dependent on a 128×296 pixel e-ink display screen paired with an nRF52832 BlueTooth Lower-Vitality SoC and employs just 65 micro-amperes on common: very low more than enough to maintain it operating for more than a calendar year on a one battery cost.

A PCB for an e-ink clock
Electricity on the still left, e-ink on the correct: the custom PCB is intelligent and compact, far too

The clock is housed in an enclosure that’s straightforward but effective: a 3D-printed triangular prism with a slot for the screen and space for the 18650 lithium battery. A single aspect can be opened to obtain the internal elements, even though which is seriously only necessary to charge the battery. You can see how cleverly almost everything snaps alongside one another in the movie embedded under.

The CPU spends most of its time in snooze manner, only waking up as soon as a moment to update the screen. In order to conserve electrical power, [Aaron] wrote this schedule in such a way that it only updates those people pixels that have really modified. Once an hour, it entirely refreshes the monitor in purchase to stop burn up-in. An built-in serious-time clock retains track of time and can be modified by means of BlueTooth by working with a smartphone application.

If you have received a bunch of related e-ink shelf labels accumulating dust, you can locate all the style and design data files and software to create your have Triink on [Aaron]’s hackaday.io webpage. In fact, you could possibly want to look through about some of his other jobs far too: he’s managed to reverse engineer 3-shade e-ink price tags for occasion, and even mixed 300 shelf labels into a giant e-ink show.


Luis Robinson

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