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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 436 · 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.True or false: “many values in a range” is an analog signal. (a) True (b) False
  3. 3.Which of these is an input? (a) a small display (b) an LED (c) a buzzer (d) a keypad
  4. 4.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  5. 5.Which of these is an output? (a) a temperature sensor (b) a servo motor (c) a keypad (d) a sound sensor
  6. 6.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  7. 7.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a servo motor
  9. 9.Which of these is an input? (a) an LED (b) a small display (c) a motion sensor (d) a servo motor
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  11. 11.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  12. 12.💡 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
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 Digital or analog: the room temperature? (a) analog (b) digital
  14. 14.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  15. 15.Which of these is an output? (a) a light sensor (b) a speaker (c) a sound sensor (d) a keypad
  16. 16.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a temperature sensor (d) a servo motor
  17. 17.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  18. 18.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a light sensor (d) a sound sensor
  19. 19.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a light sensor (d) a servo motor
  21. 21.Which of these is an input? (a) an LED (b) a servo motor (c) a water pump (d) a push button
  22. 22.Which of these is an input? (a) a servo motor (b) a buzzer (c) a temperature sensor (d) an LED
  23. 23.Which of these is an input? (a) a motor (b) a sound sensor (c) a servo motor (d) a buzzer
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  28. 28.True or false: “the room temperature” is a digital signal. (a) True (b) False
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) an LED (d) a motor
  31. 31.Which of these is an output? (a) a motor (b) a motion sensor (c) a turning knob (d) a sound sensor
  32. 32.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a temperature sensor (d) a speaker
  33. 33.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    set pin 8 LOW
    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 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 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 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.Which of these is an input? (a) a water pump (b) an LED (c) a speaker (d) a turning knob
  40. 40.📶 Digital or analog: how bright a room is? (a) digital (b) analog

Answer key

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

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