Gamepad and electric generator: what they have in common

1. Step 1. Gamepad — has part — Microcontroller. A microcontroller polls the buttons.
2. Step 2. Microcontroller — is part of — CubeSat. On-board electronics.
3. Step 3. CubeSat — has part — Solar panel. Power comes from solar panels.
4. Step 4. Solar panel — is a kind of — Electric generator. A solar panel also generates electricity — from light rather than rotation.

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