Industrial automation and smartphone: what they have in common

1. Step 1. Industrial automation — uses — Feedback control. Control.
2. Step 2. Feedback control — is used in — Anti-lock braking system (ABS). A controller watches for wheel slip.
3. Step 3. Anti-lock braking system (ABS) — has part — Hall sensor. Sensors measure the wheel speed.
4. Step 4. Hall sensor — is part of — Smartphone. A magnetometer compass.

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