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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 421 · 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.💡 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) OFF (b) ON
  2. 2.Which of these is an input? (a) a buzzer (b) a motor (c) a keypad (d) a speaker
  3. 3.True or false: “the room temperature” is a digital signal. (a) True (b) False
  4. 4.💡 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a servo motor (d) a keypad
  6. 6.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  8. 8.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  9. 9.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  10. 10.Which of these is an input? (a) a servo motor (b) a temperature sensor (c) a motor (d) a speaker
  11. 11.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a light sensor (d) a turning knob
  12. 12.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a buzzer (d) a sound sensor
  13. 13.📶 Digital or analog: the room temperature? (a) digital (b) analog
  14. 14.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  16. 16.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an input? (a) a small display (b) a water pump (c) a servo motor (d) a turning knob
  20. 20.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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) OFF (b) ON
  22. 22.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an input? (a) a sound sensor (b) an LED (c) a motor (d) a speaker
  24. 24.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) a speaker (d) a keypad
  25. 25.True or false: “many values in a range” is a digital signal. (a) False (b) True
  26. 26.💡 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
    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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a temperature sensor (d) a push button
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.💡 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 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  33. 33.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a light sensor (d) a buzzer
  36. 36.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  37. 37.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  38. 38.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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