How does pulse heartbeat sensor work?

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Tags

1. #working
2. #digital
3. #detector
4. #light
5. #pulse
6. #heart
7. #blood
8. #measure
9. #principle
10. #output
11. #unison
12. #directly
13. #works
14. #finger
15. #flashes
16. #connected
17. #through
18. #beats
19. #modulation
20. #microcontroller
21. #minute