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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 565 · 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 speaker (b) a motor (c) a servo motor (d) a keypad
  2. 2.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  3. 3.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a temperature sensor (d) a light sensor
  5. 5.Which of these is an input? (a) a motor (b) a water pump (c) an LED (d) a turning knob
  6. 6.📶 Digital or analog: many values in a range? (a) analog (b) digital
  7. 7.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a push button (d) a speaker
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  10. 10.True or false: “the room temperature” is an analog signal. (a) False (b) True
  11. 11.Which of these is an input? (a) a small display (b) a buzzer (c) a keypad (d) a water pump
  12. 12.Which of these is an output? (a) a keypad (b) a light sensor (c) a temperature sensor (d) a water pump
  13. 13.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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
  15. 15.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a servo motor (d) a temperature sensor
  16. 16.True or false: “the room temperature” is a digital signal. (a) True (b) False
  17. 17.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  20. 20.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  21. 21.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  22. 22.Which of these is an input? (a) a water pump (b) a light sensor (c) an LED (d) a motor
  23. 23.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an output? (a) a light sensor (b) a keypad (c) a buzzer (d) a motion sensor
  28. 28.🔍 Which is the odd one out? (a) a keypad (b) a speaker (c) a push button (d) a motion sensor
  29. 29.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.💡 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
  33. 33.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  34. 34.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a servo motor (d) a speaker
  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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  37. 37.Which of these is an output? (a) a push button (b) a speaker (c) a motion sensor (d) a sound sensor
  38. 38.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) an LED (d) a sound sensor
  39. 39.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: how loud a sound is? (a) digital (b) analog

Answer key

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

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