How do controllers work?

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Tags

1. #sends
2. #circuit
3. #pushed
4. #material
5. #closed
6. #button
7. #strips
8. #board
9. #metal
10. #while
11. #controller
12. #small
13. #contact
14. #conducts
15. #between
16. #beneath
17. #conductive
18. #inside
19. #senses
20. #electricity