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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 553 · 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 a speaker an input or an output for a microcontroller? (a) output (b) input
  2. 2.💡 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
  3. 3.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a sound sensor (d) a push button
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  5. 5.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  6. 6.Which of these is an input? (a) an LED (b) a servo motor (c) a push button (d) a motor
  7. 7.True or false: “the room temperature” is a digital signal. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a keypad (d) a temperature sensor
  9. 9.📶 Digital or analog: the room temperature? (a) digital (b) analog
  10. 10.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a servo motor (d) a buzzer
  11. 11.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  12. 12.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  13. 13.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  14. 14.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  15. 15.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) a motor (d) a small display
  16. 16.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  17. 17.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a keypad (d) a turning knob
  18. 18.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  21. 21.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a small display (d) a sound sensor
  22. 22.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  23. 23.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a temperature sensor (d) a light sensor
  24. 24.💡 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
  25. 25.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a motor (d) a light sensor
  26. 26.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  28. 28.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  29. 29.Which of these is an input? (a) a motion sensor (b) a small display (c) a water pump (d) an LED
  30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  32. 32.Which of these is an input? (a) a temperature sensor (b) a small display (c) a speaker (d) an LED
  33. 33.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.Which of these is an input? (a) a water pump (b) a motor (c) a sound sensor (d) a small display
  35. 35.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  36. 36.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  37. 37.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a speaker (d) a motion sensor
  38. 38.Which of these is an output? (a) a push button (b) a speaker (c) a sound sensor (d) a turning knob
  39. 39.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  40. 40.📶 How many states can a digital pin have? (a) a thousand (b) two (c) ten (d) one

Answer key

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

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