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



Thursday, February 13, 2014

New design of the LED bracelet. #3dprinting #wearable #arduino #3DxJewelry #neopixel

Changed the design of the LED bracelet to a solid curved body and using 144 LEDs/m neopixel stripe to light it instead of 60 LEDs/m. 3D files can be found at Thingiverse















Happy hacking!
Marcus





Thursday, January 30, 2014

3D printed LED bracelet. #wearable #neopixel #trinket #3dprinting #3DxJewelry

This project started when I printed Diagrid Bracelet by nervoussystem and got the idea to add some LEDs to it. I may be little obsess withe LEDs at the moment, led-jar, music visualiser.  A trinket is controlling the led strip but any smal microcontroller‎ should do. The bracelet is printed on a Form 1 using withe resin. It is still a work in progress but start to look quite nice.



Hardware

Tooles

  • 3D printer
  • Soldering iron

Software

Model

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.




First version off electronics
Version 2 has a connector so it can be disconnected from the bracelet

Model

I went through a few different versions.
Version one and two are design using openscad but when I tried to add holes to the design the program crashed after compiling a hour or so. So I tested with rhino for osx , sketchup and ended up using 123D Design.

Version 1-3

Version 2 with electronics
Version 4 I splited up in two parts so it is easier to get it on the wrist and using smal magnets to hold the parts together.


Freshly printed





Magnets glued to the bracelet

Snaps together nicely


Further improvement

Use a 144 LED/m stripe instead for 60 LED/m and add some kind of sensor so it can react to the environment. Should properly try to build in the electronics a little more into the bracelet so it do not get damage by tear and moister.

Happy hacking!
Marcus