Wearable Circuits

Paper circuits taught you the rules. Now break the flat: the same copper tape works on a sleeve, a hat brim, a jacket seam — even directly on your arm.

The two-wire mental model

Every wearable circuit you’ll ever build is two copper paths that must never touch:

1. One tape line is the positive wire — the battery’s + face and every LED’s long leg connect to it.
2. A second line, kept apart from the first, is the negative wire — the battery’s − face and the short legs land there.

Keep those two rules and you can route light along any seam, brim, or hemline your design demands.

Activity: Circuit on a body

Transfer your paper-circuit skills to something wearable: a cuff of copper tape on your forearm, a lit collar, a glowing shoe. Curved surfaces will fight you exactly where flat paper didn’t — that’s the skill being built. (Copper tape is skin-safe and peels off easily; it’s the same material stained-glass artists handle all day.)

Level up: make an object join the circuit. A paper clip, a foil star, a key — anything conductive can become a working part of the path. Can you make the accessory itself the switch: circuit closed when the bracelet clasps, open when it doesn’t?

The fairy-light hack

Need a lot of light with almost no circuitry? A strand of battery-powered fairy lights, hacked apart, is the fastest route from “dark garment” to “runway ready”:

See it in action:

And when it’s time to attach lights so they stay attached through a runway walk, our guide on three ways to attach flexi-bits to a wearable is the reference we hand every team.

For teachers: Quick win for low-confidence builders: copper tape + two LEDs on a baseball cap is a complete, wearable, working piece in twenty minutes — and a great pride generator mid-course. The “accessory as switch” challenge is where your fast finishers should go.

Before you move on

• Something wearable lights up — on a person, not a table
• You can point to your positive wire and negative wire without tracing them first