What is it?

This project is based on my original binary clock, which is powered by an Atmega328 and can set itself from a GPS receiver. This version simplifies that project down by becoming a "shield" sitting on top of a Raspberry Pi. The clock shield reads the configured time on the Raspberry Pi ... which means it effectively remains accurate by pulling the time from the Internet!

• A clock that displays the time in binary-coded-decimal.
• Nice bright LEDs in a range of different colours.
• A shield suitable for any model of Raspberry Pi (not included in the kit).
• Can be powered from any spare USB port or USB power supply.
• Great to have on your desk, or sitting on your monitor.
• Face measures about 9.5cm by 6.5cm
• About an hour to assemble.

Why did you make it?

It ticks all my boxes: it has lots of pretty lights, is a mix of electronics and programming, and is a useful (and accurate) timepiece.

What makes it special?

It's a nice, easy project that should be fun for an electronics or Pi enthusiast to build. It teaches you to read binary at speed, and its mixture of blinkenlights and "bare" electronics makes it an eye-catching gadget for the office. It's a great use for a spare Raspberry-Pi that you might have lying around. And if you want to know how to control electronics projects with your Pi, then I hope this'll be useful reference.

Note that this kit DOES NOT INCLUDE A PI! Most people have one or two in their "spares" box these days, and this project is a great use for one. Even if you don't have one, you'll know where to pick one up cheaply. If I had to keep a stock of them to sell I wouldn't be able to price them competitively. :(

What operating systems support it?

I provide C-code for Raspbian, and full instructions on how to compile and run it. My blog also includes a BBC BASIC equivalent, if you want to run it on RISC OS.