Surface-mount technology and submarine: what they have in common

1. Step 1. Surface-mount technology — uses — Printed circuit board. Mounting on the board.
2. Step 2. Printed circuit board — is part of — Remote control. Inside a remote is a circuit board with buttons and an infrared LED.
3. Step 3. Remote control — has part — Microcontroller. A microcontroller sends the codes.
4. Step 4. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
5. Step 5. Parking sensor — works like — Sonar. Echolocation in air.
6. Step 6. Sonar — is part of — Submarine. Underwater acoustics.

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