Printed circuit board and fitness tracker: what they have in common

1. Step 1. Printed circuit board — is part of — Touchpad. The sensor grid is on a circuit board.
2. Step 2. Touchpad — works like — Touch layer (capacitive). The same capacitive sensing without a screen.
3. Step 3. Touch layer (capacitive) — is part of — Smartwatch. A touchscreen.
4. Step 4. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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