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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 653 · 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 an LED an input or an output for a microcontroller? (a) output (b) input
  2. 2.Which of these is an input? (a) a motion sensor (b) a buzzer (c) a small display (d) an LED
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  4. 4.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  5. 5.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  6. 6.Which of these is an input? (a) a motor (b) a keypad (c) a servo motor (d) a small display
  7. 7.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a water pump (d) a push button
  10. 10.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  12. 12.💡 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
  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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔍 Which is the odd one out? (a) a servo motor (b) a temperature sensor (c) a small display (d) a buzzer
  15. 15.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  18. 18.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  19. 19.💡 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
  20. 20.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  21. 21.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a push button (d) a motor
  22. 22.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a motor (d) a motion sensor
  23. 23.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  24. 24.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a speaker (d) a motor
  25. 25.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  26. 26.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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
  28. 28.🔍 Which is the odd one out? (a) a push button (b) a small display (c) a turning knob (d) a sound sensor
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an output? (a) an LED (b) a light sensor (c) a temperature sensor (d) a turning knob
  31. 31.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  32. 32.Which of these is an output? (a) a turning knob (b) a keypad (c) a temperature sensor (d) a water pump
  33. 33.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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) OFF (b) ON
  36. 36.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  37. 37.Which of these is an input? (a) a small display (b) a servo motor (c) a buzzer (d) a sound sensor
  38. 38.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.Which of these is an input? (a) a small display (b) a push button (c) a water pump (d) a speaker
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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