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.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.