I do not wear much jewellery, apart from a wedding ring and some cufflinks. At lot of my cufflinks are Traffic Light themed. However I wanted something unique.

So I decided to build some real Traffic Light cufflinks. I would not be able to design, prototype and build this in previous years - without a BIG development budget . However with 3D printing available in metal - it is not possible for a hobby development like myself.

All the hardware and associated software is open sourced.

The cufflinks - do:-
- Normal UK Sequence. (Red, Red-Amber, Green, Amber, Red)
- Normal Pelican Sequence. (Red, Flashing Amber, Green, Amber, Red)
- Report the time  (Series of encoded flashes)
- Report the date (Series of encoded flashes)
- Current Temperature in Celsius (..flashes)
- Stored number of up to 20 digits. (..flashes)

The case act as a touch sensor. Every four seconds the ATtiny wakes up to see if the case is being touched. This ensures that the coin cell isn’t drained by constantly driving the LEDs. Then displays one of the above based upon the number of touches.

Step 1: Early Prototypes

I started off making a plain Stainless Steel cufflink. Modelled in OpenSCAD. To get the hang of using 3d Printing services online. They look fantastic - so I started development of an electronic version.

OpenSCAD is wonderful, but even better - which I have now used for the latest prototypes is SolidPython. It allows python to generate the OpenSCAD file, which than can be used to generate the 3d "STL" file than can be sent off for printing (Shapeways, i.materialise, or Sculpteo)
What LEDs does this use, and what current are they running on? They seem pretty bright for a 927 battery.
Beautiful! I love functional miniaturized antiquities. We are so casual in our society. Bringing up to date stylized apparel. You got my vote!
Thanks potterguyttoo. I liek that they are functional - great being able to get the temperature on my cufflinks.<br><br>Also thanks for the vote - it I won I would be able to make start development on cufflinks that do other functional things.
well cool!
I didn't know of the traffic light patters in the uk, I wish we had the red/amber thing here so we could know when the light was almost done.
This is just awesome. Thanks for sharing.
Absolutely brilliant! Would you be selling these at all?
They are hand soldered, so the labour costs would be quite high - as my soldering skill are not very good at all. My surface-mount-soldering-frying-pan technique is far from perfected.

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