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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 549 · 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 buzzer (b) a speaker (c) a motor (d) a light sensor
  2. 2.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  3. 3.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a servo motor (d) a sound sensor
  4. 4.💡 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
  5. 5.🔍 Which is the odd one out? (a) a speaker (b) a sound sensor (c) a light sensor (d) a keypad
  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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  8. 8.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a buzzer (d) a water pump
  9. 9.🔍 Which is the odd one out? (a) a water pump (b) a motor (c) a servo motor (d) a turning knob
  10. 10.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  12. 12.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an input? (a) a buzzer (b) a servo motor (c) a motor (d) a temperature sensor
  14. 14.💡 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 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.Which of these is an output? (a) a turning knob (b) a keypad (c) a light sensor (d) a buzzer
  16. 16.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) an LED (d) a temperature sensor
  18. 18.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a speaker (d) a buzzer
  20. 20.Which of these is an output? (a) a sound sensor (b) a small display (c) a push button (d) a keypad
  21. 21.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  22. 22.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a turning knob (d) a keypad
  24. 24.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  25. 25.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a push button (d) a motor
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an input? (a) a speaker (b) a push button (c) a small display (d) a water pump
  29. 29.Which of these is an output? (a) an LED (b) a motion sensor (c) a push button (d) a temperature sensor
  30. 30.Which of these is an output? (a) a push button (b) a turning knob (c) a speaker (d) a motion sensor
  31. 31.💡 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
    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
  32. 32.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.📶 Digital or analog: the room temperature? (a) digital (b) analog
  34. 34.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  35. 35.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a speaker (d) a sound sensor
  36. 36.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  37. 37.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  38. 38.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False

Answer key

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

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