Self-checkout and electrical telegraph: what they have in common

1. Step 1. Self-checkout — has part — Touch layer (capacitive). A touchscreen.
2. Step 2. Touch layer (capacitive) — works like — Touchpad. The same capacitive sensing without a screen.
3. Step 3. Touchpad — has part — Printed circuit board. The sensor grid is on a circuit board.
4. Step 4. Printed circuit board — has part — Copper wire. Copper traces.
5. Step 5. Copper wire — is part of — Electrical telegraph. Communication lines.

Open Evothings