Paper feed rollers and radar: what they have in common

1. Step 1. Paper feed rollers — is part of — Printer. Rollers pull the sheet through.
2. Step 2. Printer — has part — Microcontroller. A controller processes the print job.
3. Step 3. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
4. Step 4. Parking sensor — works like — Radar. A parking sensor, like radar, catches a reflected signal — only ultrasonic.

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