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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 204 · 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 light sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a motor (d) a turning knob
  3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  4. 4.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a light sensor (d) a buzzer
  6. 6.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  7. 7.💡 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
  8. 8.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  10. 10.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.Which of these is an input? (a) an LED (b) a buzzer (c) a small display (d) a turning knob
  12. 12.Which of these is an output? (a) a push button (b) a motion sensor (c) a light sensor (d) a motor
  13. 13.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  15. 15.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  16. 16.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  17. 17.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  18. 18.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.Which of these is an input? (a) a speaker (b) a push button (c) an LED (d) a servo motor
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.📶 Digital or analog: many values in a range? (a) analog (b) digital
  24. 24.🔍 Which is the odd one out? (a) a small display (b) a motion sensor (c) a water pump (d) an LED
  25. 25.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) an LED (d) a motion sensor
  26. 26.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    set pin 8 HIGH
    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) an LED (b) a speaker (c) a small display (d) a motion sensor
  29. 29.Which of these is an input? (a) a small display (b) a light sensor (c) a water pump (d) a speaker
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  31. 31.💡 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
  32. 32.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  33. 33.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  36. 36.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  37. 37.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  38. 38.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  39. 39.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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