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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 213 · 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.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 An LED (with its resistor) is on pin 7. 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
  5. 5.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a small display (d) a push button
  6. 6.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  8. 8.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a keypad (d) a light sensor
  12. 12.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  13. 13.Which of these is an output? (a) a buzzer (b) a turning knob (c) a push button (d) a keypad
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  15. 15.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  16. 16.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  17. 17.Which of these is an input? (a) a speaker (b) a water pump (c) an LED (d) a light sensor
  18. 18.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a small display (d) a push button
  19. 19.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  20. 20.Which of these is an input? (a) a water pump (b) a speaker (c) a sound sensor (d) a buzzer
  21. 21.True or false: “many values in a range” is an analog signal. (a) True (b) False
  22. 22.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  24. 24.Which of these is an input? (a) a small display (b) a buzzer (c) a servo motor (d) a turning knob
  25. 25.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  26. 26.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  27. 27.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  28. 28.True or false: “many values in a range” is a digital signal. (a) True (b) False
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  31. 31.Which of these is an input? (a) a small display (b) a water pump (c) a push button (d) an LED
  32. 32.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a sound sensor (d) a motion sensor
  36. 36.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  37. 37.📶 Digital or analog: the room temperature? (a) digital (b) analog
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a water pump (d) a servo motor
  40. 40.💡 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

Answer key

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

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