February 20, 2014 AT 3:00 am

LED Bracelet Changes Color Via Accelerometer #3DxJewelry #3DThursday #3DPrinting #wearable #arduino

Marcus Olsson shared a 3D printed LED bracelet project with us, posted on slickstreamer.

Marcus: “This project started when I printed Diagrid Bracelet by nervoussystem and got the idea to add some LEDs to it. I later change the design to be a solid half circle that locks really nice when the LEDs lighten it up. A adafruit trinket (Attiny85) is controlling a Neopixel 144 LED/m strip and reading value from a FLORA Accelerometer/Compass Sensor (LSM303) using I2C.”

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.

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Featured Adafruit Product!

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Adafruit NeoPixel Digital RGB LED Strip 144 LED – BLACK: We crammed ALL THE NEOPIXELS into this strip! An unbelievable 144 individually-controllable LED pixels on a flexible PCB. It’s completely out of control and ready for you to blink. This strip has a black mask, and an extra heavy flex PCB. These LED strips are even more fun and glowy. There are 144 RGB LEDs per meter, and you can control each LED individually! Yes, that’s right, this is the digitally-addressable type of LED strip. You can set the color of each LED’s red, green and blue component with 8-bit PWM precision (so 24-bit color per pixel). The LEDs are controlled by shift-registers that are chained up and down the strip so you can shorten or lengthen the strip. Only 1 digital out pin is required to send data. The PWM is built into each LED-chip so once you set the color you can stop talking to the strip and it will continue to PWM all the LEDs for you. (read more)

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