The fur trim on my jacket goes all the way around the outside edges, and also around the sleeves. For this design I decided to use lights with 15mm spacing for smooth, higher-resolution animations.
I tried my best to figure out a way to do this in one run of lights, without any breaks. These lights are inexpensive enough that I can spare a few extras, plus I can turn off any segment of lights in WLED, so even if I'm transversing an area that I want to stay dark, it's easiest to use one continuous strand of lights.
Add enough lead wire to your light strand so your first LED can be centered - mine is centered in the lower back, so I have about 8" of wire to reach the pocket where the microcontroller will be.
Use a thread ripper to open up the trim near the microcontroller pocket and also inside the shoulder seams.
The JST connector on the lights is big and corner-y and has lots of snaggy bits that will catch on everything as you try and work it through the trim. To make this easier, I covered the whole connector in gaffer's tape so anything that might catch on fabric is covered, then put a large safety pin through the tape to give myself something to grab and pull.
Be patient and take your time with this. Getting the lights in is harder than it looks.
Once your lights are in place, cut a hole in the back of the pocket and slip your on/off switch and Feather through so they're inside the pocket. Sew them in place by hand by looping around the wires or using the mounting holes on the Feather.
Plug your battery into the other end of the switch with a short USB cable and slip that into your pocket as well.
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