Monday, February 17, 2014

LED Bracelet - Accelerometer. #3dprinting #wearable #arduino #3DxJewelry

To get the bracelet to interact with the environment I added an 3-axis accelerometer for catching the wearers movements.


The bracelet will cycle throw the color wheal slow and if get shaken it hop a few colours and if shaken for longer time it start to sparkel. It will run for about 3 and a half hour on a charge.


To get the code to work and fit on the trinket/gemma I had to rewrite Adafruit LSM303 library to use TinyWireM and int32_t instead of float to save space, I also remove the compass part of the library. The Arduino sketch is 5,214 bytes of a 5,310 byte maximum.

Related post

  1. First version of the bracelet post
  2. New design  post

Hardware


Tooles

  • 3D printer
  • Soldering iron

Software


Model

Download at thingivers

Design

Circuit Diagram

Connect the led stripe to D1 to one of the trinkets pins, I use pin 1, and connect +5v to the battery positiv and GRD to negativ. To connect the accelerometer use pin 0 for SDA and pin 2 for SCL.





Photos







Happy hacking!
Marcus