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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 302 · 40 questions
TalentJR

Remember (Read in, drive out): Inputs: buttons, knobs, sensors. Outputs: LEDs, buzzers, motors, displays. Digital: HIGH (≈ 5 V) or LOW (0 V) only. Analog: any value in a range. Trace the program: only the LED’s own pin matters, and its last command decides ON or OFF.

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  1. 1.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a buzzer (d) a light sensor
  3. 3.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  4. 4.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a servo motor (d) a sound sensor
  5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  6. 6.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  8. 8.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  9. 9.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  10. 10.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a push button (d) a speaker
  11. 11.True or false: “the room temperature” is a digital signal. (a) True (b) False
  12. 12.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a keypad (d) a water pump
  13. 13.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) an LED
  14. 14.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  15. 15.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  16. 16.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a servo motor (d) a turning knob
  18. 18.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  19. 19.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  20. 20.📶 Digital or analog: the room temperature? (a) digital (b) analog
  21. 21.🔍 Which is the odd one out? (a) a speaker (b) a water pump (c) a buzzer (d) a light sensor
  22. 22.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  23. 23.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.True or false: “the room temperature” is an analog signal. (a) False (b) True
  25. 25.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  26. 26.Which of these is an input? (a) a speaker (b) an LED (c) a servo motor (d) a temperature sensor
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an output? (a) a small display (b) a motion sensor (c) a turning knob (d) a keypad
  29. 29.True or false: “many values in a range” is a digital signal. (a) False (b) True
  30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  32. 32.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  33. 33.Which of these is an input? (a) a speaker (b) a keypad (c) an LED (d) a buzzer
  34. 34.Which of these is an output? (a) a turning knob (b) an LED (c) a sound sensor (d) a light sensor
  35. 35.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  36. 36.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  37. 37.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a sound sensor (d) a push button
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  39. 39.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  40. 40.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output

Answer key

  1. OFF
  2. a buzzer
  3. digital
  4. a sound sensor
  5. input
  6. OFF
  7. output
  8. 0 V
  9. an input
  10. a push button
  11. False
  12. a keypad
  13. an LED
  14. False
  15. digital
  16. True
  17. a servo motor
  18. output
  19. 5 V
  20. analog
  21. a light sensor
  22. False
  23. OFF
  24. True
  25. input
  26. a temperature sensor
  27. OFF
  28. a small display
  29. False
  30. ON
  31. output
  32. True
  33. a keypad
  34. an LED
  35. two
  36. True
  37. a motor
  38. digital
  39. False
  40. input

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