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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 678 · 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 of these is an input? (a) an LED (b) a motor (c) a turning knob (d) a buzzer
  2. 2.Which of these is an output? (a) a sound sensor (b) a water pump (c) a motion sensor (d) a temperature sensor
  3. 3.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  4. 4.Which of these is an output? (a) a push button (b) a motion sensor (c) a speaker (d) a temperature sensor
  5. 5.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  6. 6.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  7. 7.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  8. 8.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a speaker (d) a sound sensor
  10. 10.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a light sensor (d) a water pump
  11. 11.📶 Digital or analog: the room temperature? (a) digital (b) analog
  12. 12.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  13. 13.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  15. 15.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.Which of these is an input? (a) a speaker (b) an LED (c) a motor (d) a motion sensor
  18. 18.Which of these is an input? (a) an LED (b) a small display (c) a buzzer (d) a keypad
  19. 19.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a small display (d) a temperature sensor
  20. 20.💡 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) OFF (b) ON
  21. 21.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  23. 23.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a keypad (d) a motion sensor
  24. 24.True or false: “many values in a range” is a digital signal. (a) True (b) False
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “the room temperature” is an analog signal. (a) False (b) True
  31. 31.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  32. 32.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  35. 35.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  36. 36.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) a temperature sensor (d) a light sensor
  37. 37.🔍 Which is the odd one out? (a) a keypad (b) a temperature sensor (c) a speaker (d) a motion sensor
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  39. 39.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True

Answer key

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

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