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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 53 · 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 is the odd one out? (a) an LED (b) a speaker (c) a servo motor (d) a temperature sensor
  2. 2.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  3. 3.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  4. 4.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.Which of these is an input? (a) a servo motor (b) a speaker (c) a water pump (d) a temperature sensor
  7. 7.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a motion sensor (d) a small display
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  11. 11.Which of these is an output? (a) a buzzer (b) a motion sensor (c) a temperature sensor (d) a light sensor
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  13. 13.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  14. 14.📶 Digital or analog: the room temperature? (a) analog (b) digital
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  18. 18.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔍 Which is the odd one out? (a) a turning knob (b) an LED (c) a servo motor (d) a small display
  20. 20.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  21. 21.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  22. 22.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  24. 24.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a servo motor (d) a temperature sensor
  26. 26.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 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 input? (a) an LED (b) a keypad (c) a servo motor (d) a small display
  29. 29.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  30. 30.Which of these is an input? (a) a motor (b) a turning knob (c) an LED (d) a servo motor
  31. 31.Which of these is an output? (a) an LED (b) a temperature sensor (c) a keypad (d) a turning knob
  32. 32.Which of these is an input? (a) a servo motor (b) a speaker (c) a light sensor (d) an LED
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a sound sensor (d) a small display
  35. 35.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  36. 36.💡 An LED (with its resistor) is on pin 7. 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) OFF (b) ON
  37. 37.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.True or false: “many values in a range” is an analog signal. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a light sensor (d) an LED
  40. 40.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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