Fingerprint scanner and router: what they have in common

1. Step 1. Fingerprint scanner — uses — Capacitance. A capacitive scanner.
2. Step 2. Capacitance — is used in — Touch layer (capacitive). A finger changes the capacitance between electrodes; the controller calculates the point of touch.
3. Step 3. Touch layer (capacitive) — is part of — Smartwatch. A touchscreen.
4. Step 4. Smartwatch — has part — System on a chip (SoC). Inside is a system on a chip.
5. Step 5. System on a chip (SoC) — is part of — Router. A packet-processing processor.

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