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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 466 · 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.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  2. 2.Which of these is an input? (a) a small display (b) a buzzer (c) an LED (d) a sound sensor
  3. 3.True or false: “many values in a range” is an analog signal. (a) False (b) True
  4. 4.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) a motion sensor (d) a sound sensor
  5. 5.Which of these is an input? (a) a motion sensor (b) an LED (c) a small display (d) a servo motor
  6. 6.💡 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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.Which of these is an output? (a) a water pump (b) a push button (c) a light sensor (d) a motion sensor
  9. 9.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  10. 10.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  11. 11.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  12. 12.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.Which of these is an input? (a) a servo motor (b) a light sensor (c) an LED (d) a speaker
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.Which of these is an output? (a) a temperature sensor (b) a small display (c) a motion sensor (d) a keypad
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  18. 18.Which of these is an output? (a) a sound sensor (b) a keypad (c) a speaker (d) a turning knob
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  21. 21.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  23. 23.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a light sensor (d) a push button
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  25. 25.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  26. 26.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  27. 27.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  28. 28.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.True or false: “the room temperature” is a digital signal. (a) True (b) False
  30. 30.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) an LED (d) a push button
  33. 33.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a light sensor
  34. 34.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a push button (d) a buzzer
  36. 36.💡 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) ON (b) OFF
  37. 37.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) an LED (d) a light sensor
  39. 39.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  40. 40.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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