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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 845 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  2. 2.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a temperature sensor (d) a keypad
  3. 3.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  6. 6.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  9. 9.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  16. 16.Which of these is an output? (a) a keypad (b) a small display (c) a turning knob (d) a temperature sensor
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an input? (a) an LED (b) a turning knob (c) a small display (d) a buzzer
  19. 19.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) an LED (d) a keypad
  24. 24.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) a servo motor (d) a speaker
  25. 25.Which of these is an input? (a) a servo motor (b) an LED (c) a push button (d) a motor
  26. 26.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  27. 27.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  28. 28.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  29. 29.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  30. 30.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.True or false: “the room temperature” is an analog signal. (a) False (b) True
  33. 33.Which of these is an input? (a) a small display (b) a servo motor (c) an LED (d) a motion sensor
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an input? (a) a temperature sensor (b) a small display (c) a servo motor (d) a motor
  37. 37.Which of these is an input? (a) a speaker (b) a light sensor (c) a small display (d) an LED
  38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  40. 40.🔍 Which is the odd one out? (a) a turning knob (b) a speaker (c) a push button (d) a temperature sensor

Answer key

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

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