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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 409 · 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 output? (a) a turning knob (b) a speaker (c) a light sensor (d) a sound sensor
  2. 2.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  3. 3.Which of these is an output? (a) a sound sensor (b) a turning knob (c) a keypad (d) a small display
  4. 4.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a servo motor (c) a push button (d) a keypad
  6. 6.📶 Digital or analog: the room temperature? (a) digital (b) analog
  7. 7.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.True or false: “the room temperature” is a digital signal. (a) False (b) True
  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 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  12. 12.💡 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) OFF (b) ON
  13. 13.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  14. 14.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a buzzer
  15. 15.💡 An LED (with its resistor) is on pin 7. 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a push button (d) a small display
  17. 17.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a push button (d) a motor
  19. 19.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a sound sensor (d) an LED
  20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a motor (b) a temperature sensor (c) a small display (d) a servo motor
  22. 22.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  23. 23.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an output? (a) a turning knob (b) an LED (c) a light sensor (d) a push button
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a turning knob (d) a buzzer
  27. 27.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  28. 28.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) an input (d) a resistor
  29. 29.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  33. 33.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  34. 34.💡 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
  35. 35.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  38. 38.💡 An LED (with its resistor) is on pin 7. 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
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “how loud a sound is” is a digital signal. (a) False (b) True

Answer key

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

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