Picture of BLU - A wearable sensor/status bracelet
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This project was undertaken as I was applying for Intel's "Make it Wearable" contest (

Trailer of that contest:


Although I did not win I decided to try to build my idea. While the idea is not so simple here it is summarized [also see video]: a wearable device that has embedded sensors to monitor your environment and give you feedback/information on certain parameters and most prominently the quality of air and water.

This is only step one: designing a simple bracelet that displays the status of anything with embedded LEDs in a nice light diffusing 3D printed casing. Hopefully later down the road I'll be able to achieve the final goal as described in the BLU video.

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Step 1: The Casing

Picture of The Casing
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The original design is the white 3D printed bracelet - it was too fragile and turned out quite ugly...

The second try; a much simpler design worked quite well. Simple arcs with a hollow portion in the middle. There is the main body and the cover. The design is very solid, and diffuses the light. It may not look super classy - but it ain't too bad either!

Step 2: Light Diffusion

Picture of Light Diffusion

To have a nice and diffused light I utilized a few different tricks:

  1. I used Suguru ( A little dab of white suguru on each LED and the light was much "softer".
  2. I put a layer of white paper inside the walls of the bracelet and transparent (opaque) tape on the paper.

Step 3: The Electronics

Picture of The Electronics
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The electronics are very simple:

- Arduino Gemma ( ) [although any mini Arduino will do!]

- Lithium cell battery

- 3 or more Neopixels (

And they all nicely fit into the casing!

For the battery, any battery should do... but I have a preference for lithium as they are small, hold a decent charge, are easy to get and have the ability to be recharged.

This is a really good idea. Imagine if the tech was made affordable to people in developing areas...

lol yes

Wow, this is so pretty!

Thanks! :)

gada8883 months ago

The code is a bit strange,GEMMA utilize the juice of an attiny85,while attiny85 doesn't support serial the result is it won't complie.