Fingerprint scanner and internal combustion engine: what they have in common

1. Step 1. Fingerprint scanner — is part of — Smartphone. A fingerprint scanner.
2. Step 2. Smartphone — has part — Hall sensor. A magnetometer compass.
3. Step 3. Hall sensor — is part of — Anti-lock braking system (ABS). Sensors measure the wheel speed.
4. Step 4. Anti-lock braking system (ABS) — uses — Engine control unit. The ABS unit.
5. Step 5. Engine control unit — is part of — Internal combustion engine. An engine control unit.

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