Echo sounder and joystick: what they have in common

1. Step 1. Echo sounder — evolved into — Sonar. Echolocation.
2. Step 2. Sonar — works like — Parking sensor. Echolocation in air.
3. Step 3. Parking sensor — has part — Microcontroller. A microcontroller calculates the distance.
4. Step 4. Microcontroller — is part of — Gamepad. A microcontroller polls the buttons.
5. Step 5. Gamepad — evolved from — Joystick. A game controller.

Open Evothings