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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 365 · 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.Which of these is an input? (a) a sound sensor (b) a servo motor (c) a buzzer (d) a speaker
  2. 2.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  3. 3.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  5. 5.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  6. 6.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a turning knob (d) a small display
  9. 9.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  10. 10.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  11. 11.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a keypad (d) a small display
  12. 12.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  13. 13.📶 Digital or analog: the room temperature? (a) analog (b) digital
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a push button (d) a motion sensor
  15. 15.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a turning knob (d) a speaker
  16. 16.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a motion sensor (d) a turning knob
  19. 19.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  20. 20.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) an input (d) a resistor
  21. 21.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  22. 22.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  23. 23.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  24. 24.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  25. 25.Which of these is an input? (a) a buzzer (b) a motion sensor (c) a speaker (d) an LED
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  27. 27.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a light sensor (d) a servo motor
  28. 28.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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
  31. 31.💡 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) OFF (b) ON
  32. 32.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  34. 34.True or false: “the room temperature” is a digital signal. (a) True (b) False
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔍 Which is the odd one out? (a) a motor (b) a servo motor (c) a water pump (d) a motion sensor

Answer key

  1. a sound sensor
  2. output
  3. OFF
  4. 5 V
  5. 0 V
  6. OFF
  7. input
  8. a turning knob
  9. False
  10. output
  11. a keypad
  12. OFF
  13. analog
  14. a water pump
  15. a speaker
  16. analog
  17. ON
  18. a servo motor
  19. input
  20. an input
  21. False
  22. digital
  23. input
  24. False
  25. a motion sensor
  26. input
  27. a servo motor
  28. input
  29. ON
  30. OFF
  31. OFF
  32. OFF
  33. output
  34. False
  35. OFF
  36. ON
  37. OFF
  38. False
  39. input
  40. a motion sensor

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