LED wearables let you change colors to match your outfit or your mood. This customizable cuff, made from simple craft materials, uses two LED strips which diffuse and mix their colors into hot glue "gems" to produce dynamic color gradients spanning the spectrum.
The small, versatile QT Py board can create complex color patterns with simple CircuitPython code, and the bracelet itself is a surprisingly straightforward build - using tools no more complex than a hot glue gun and soldering iron.
There's no need for an power switch, because the board and LEDs obtain power from a LiPo battery with a male USB C connector soldered to the leads. The USB C connector doubles as a clasp, turning the QT Py board and LED strips on when closed.
The EVA foam casing makes this cuff soft and flexible, fitting comfortably on the wrist, but also protects and secures electronics and wires. Memory wire loops, sandwiched between the foam layers, add structure and define and maintain the cuff shape while preventing strain on solder joints and connections.
Parts for the Cuff:
If you need wire and heat shrink tubing:
Parts for the Battery Charger
- 1x USB C male breakout with solder pads for power connections. These breakouts from Amazon come with housings that aren't needed for this project.
- 2x Sheet of 2-3mm Thick Adhesive EVA Foam, like these from Amazon.
- Translucent white hot glue sticks. These ones with glitter add an extra sparkle to the project, but any translucent white color glue stick will do.
- Memory wire (only 2 coils are needed for this project), available on Amazon or in many bead and craft stores
- Electrical tape
- Hot glue gun compatible with the glue sticks
- Soldering iron/solder
- Wire cutters
- Craft knife or sharp scissors