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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 347 · 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 is the odd one out? (a) a keypad (b) a light sensor (c) a motion sensor (d) a speaker
  2. 2.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  3. 3.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  4. 4.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  5. 5.💡 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 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.Which of these is an output? (a) a push button (b) a turning knob (c) an LED (d) a keypad
  8. 8.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  9. 9.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an input? (a) a buzzer (b) a small display (c) a motor (d) a push button
  12. 12.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an input? (a) a light sensor (b) a small display (c) a motor (d) a speaker
  15. 15.💡 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 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  18. 18.Which of these is an input? (a) a temperature sensor (b) an LED (c) a buzzer (d) a speaker
  19. 19.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  20. 20.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a push button (d) a light sensor
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
  23. 23.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  26. 26.Which of these is an output? (a) a light sensor (b) a speaker (c) a temperature sensor (d) a push button
  27. 27.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  29. 29.True or false: “the room temperature” is an analog signal. (a) True (b) False
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  31. 31.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  32. 32.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a servo motor (d) a light sensor
  33. 33.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  34. 34.True or false: “the room temperature” is a digital signal. (a) True (b) False
  35. 35.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  36. 36.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  37. 37.🔍 Which is the odd one out? (a) a water pump (b) a keypad (c) a buzzer (d) an LED
  38. 38.💡 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) ON (b) OFF
  39. 39.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 An LED (with its resistor) is on pin 7. 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

Answer key

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

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