This Watch Tells Time With A Single Needle On An Analog Meter

Most watch displays — digital or e-ink or even classic analog hands — are built to show multiple things at once: hours, minutes, sometimes seconds. Sahko’s watch flips that assumption, using a single sweeping needle borrowed from an analog panel meter to display one value at a time.

What They Built

The watch is built around a simple analog coil meter, the kind normally used to show voltage or current on a piece of test equipment, repurposed here as a time display. A Raspberry Pi Pico drives the meter through a digital-to-analog converter, sweeping the needle to whatever position corresponds to the current hour, minute/second, month, or day of the week — selected by pressing buttons on the case.

How They Did It

Two details push this past a quick proof of concept. The dial backer isn’t printed paper, it’s a custom PCB, giving it a far more durable, professional finish than the usual paper-and-laminate approach. And the case itself is CNC-milled out of aluminum and bead-blasted for a clean industrial surface finish — the kind of fit and finish that makes a one-off build feel closer to a manufactured instrument.

Why It’s Worth Your Time

Trading a multi-hand or digital display for a single needle is a real design compromise — you genuinely can’t see two values at once — but it produces an instrument-panel aesthetic that nothing else in this roundup has, and it’s a clean example of a watch project where the dial mechanism itself is the hack, not just the electronics behind it.

Go See It

Sahko’s build is documented on GitHub, and Hackaday covered the project with photos and a demo video.