IR Sensors: Self-Assessment Questions

Listed below are the self-assessment questions for the video on IR Sensors:

1. Describe the differences between passive and active IR sensors.
2. Which circuit component is used to set a threshold detection level?
3. The resistance of the photodiode ____ when light hits it, causing the voltage drop across the series resistor to ____.
4.  T/F: If an IR sensor is unable to detect an object (for example, if the object is all black), increasing its sensitivity will fix the problem.
5. Name 3 possible causes of failure for IR sensors.
6. Which is NOT an advantage of IR sensors?
   A. Low power requirements
   B. Can be used over long ranges
   C. Can be used in day and nighttime conditions
   D. Cheap

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