The circuit board and the battery/switch carrier won’t fit in if they are attached in one piece. So what I did was use magnets so that after they are put in they snap together into a single unit and won’t rattle around or come lose. They pivot a little to fit the space inside the platform but don’t shift when I walk.
If I did not have very small fingers it would have been impossible to fit everything in neatly and even then it took almost an hour per shoe to get the LED strip in the right place and slide everything carefully in.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.