Build a binary wall clock for just a few bucks

The weekend is almost here and if you’re looking for an afternoon project consider building your own binary wall clock. [Emihackr97] built the one you see above using parts on hand, but even if you put in an order for everything, it won’t cost you much.

He used a cardboard box as the housing for the clock, marking a grid for the LEDs on the face and drilling holes to house them. Two columns for hours and another two for minutes let the clock display 24-hour time with alternate firmware for 12 hour time. Since there are two buttons – one to set hours, the other to set minutes – a little coding would make it possible to select between the two either by clicking both buttons at once, or holding down one button.

[Emihackr97] is driving the display with an ATmega48, which is a pin-compatible replacement for the ATmega168/328. Those chips are the type most commonly found on Arduino boards an indeed this project is running the Arduino bootloader, but uses an ISP programmer and breadboarded circuit to keep the costs low. There are plenty of pins to drive the 13 LEDs directly, making the soldering quick and painless. Check out a demo clip after the break.

If you’re successful at this build and get the itch for something with more style, there’s a ton of ways to spice up the look of a binary clock.

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Three digit binary clock

Here’s a three digit binary clock that [Viktor] designed. It uses a multiplexed display to drive one digit at a time with a PIC 16F628A. The video after the break shows it ticking away, display hours, minutes, and seconds in blue LEDs. You may be wondering why those LEDs are not flush to the board? [Viktor] took the project one step further than most binary clock projects, designing a PCB to fit into the enclosure of an old laptop PSU and then having the board manufactured. With options like DorkbotPDX groups orders its has become quite inexpensive to do this and it’s really good practice for when you need to design a highly complicated board for that super-fantastic project of the future.

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