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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 261 · 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.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  2. 2.Which of these is an output? (a) a light sensor (b) a turning knob (c) an LED (d) a motion sensor
  3. 3.💡 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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a small display (d) a sound sensor
  5. 5.📶 Digital or analog: many values in a range? (a) digital (b) analog
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  7. 7.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) an LED (d) a temperature sensor
  8. 8.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a servo motor (d) a small display
  9. 9.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  11. 11.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a temperature sensor (d) a push button
  12. 12.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.Which of these is an output? (a) a push button (b) a speaker (c) a sound sensor (d) a temperature sensor
  16. 16.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  17. 17.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  18. 18.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a small display (d) a push button
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.Which of these is an input? (a) a push button (b) a motor (c) a speaker (d) a water pump
  21. 21.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  22. 22.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  23. 23.💡 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) ON (b) OFF
  24. 24.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  25. 25.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a buzzer (d) a keypad
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  28. 28.Which of these is an input? (a) an LED (b) a speaker (c) a light sensor (d) a buzzer
  29. 29.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “the room temperature” is a digital signal. (a) True (b) False
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.Which of these is an input? (a) a buzzer (b) a motion sensor (c) a speaker (d) a motor
  33. 33.💡 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) ON (b) OFF
  34. 34.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  35. 35.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  36. 36.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  37. 37.🔍 Which is the odd one out? (a) a turning knob (b) an LED (c) a push button (d) a temperature sensor
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  39. 39.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  40. 40.Which of these is an output? (a) a servo motor (b) a turning knob (c) a light sensor (d) a sound sensor

Answer key

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

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