Circuit Diagram & Code

The Bluefruit Micro has been discontinued, you can try using the Feather 32u4 Bluefruit!

This is a schematic diagram to clearly show the connections between components with minimal wire crossings — it does not represent the actual placement around the collar.

Download sample audio files and Arduino sketch are here:

One of the sequins is always on, sliced from the battery pack. The other is connected to an analog out on the Bluefruit Micro, so we can trigger it to light up when the sound is triggered to create a "talking" light.

We strongly recommend prototyping this project on a solderless breadboard first, if you can spare the second set of parts (the collar is assembled without header pins). When assembling things into the collar, things can get a bit confusing, so it's always nice to have a working version of the circuit to reference!

This guide was first published on Oct 21, 2015. It was last updated on Nov 19, 2018. This page (Circuit Diagram & Code) was last updated on Jan 24, 2017.