Barcode scanner and headphones: what they have in common

1. Step 1. Barcode scanner — is part of — Self-checkout. It reads the goods.
2. Step 2. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
3. Step 3. Touch layer (capacitive) — works like — Touchpad. The same capacitive sensing without a screen.
4. Step 4. Touchpad — has part — Printed circuit board. The sensor grid is on a circuit board.
5. Step 5. Printed circuit board — has part — Copper wire. Copper traces.
6. Step 6. Copper wire — is part of — Headphones. A cable.

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