Why sensors are used in robots?

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Tags

1. #generally
2. #other
3. #kinds
4. #robots
5. #difference
6. #sensor
7. #sensors
8. #rarely
9. #phototubes
10. #light
11. #photovoltaic
12. #voltage
13. #phototransistors
14. #create
15. #cells
16. #photoresistor
17. #detect