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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 584 · 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: “a button: pressed or not” is an analog signal. (a) False (b) True
  2. 2.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) an LED (d) a light sensor
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a buzzer (d) a keypad
  5. 5.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  6. 6.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  7. 7.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  8. 8.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  9. 9.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  10. 10.Which of these is an output? (a) a temperature sensor (b) a buzzer (c) a push button (d) a turning knob
  11. 11.True or false: “many values in a range” is a digital signal. (a) False (b) True
  12. 12.💡 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 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.True or false: “the room temperature” is an analog signal. (a) True (b) False
  14. 14.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  16. 16.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  17. 17.💡 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 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a light sensor (b) a motor (c) a small display (d) a buzzer
  20. 20.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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) ON (b) OFF
  22. 22.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  23. 23.Which of these is an output? (a) a speaker (b) a motion sensor (c) a sound sensor (d) a keypad
  24. 24.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.Which of these is an input? (a) a motor (b) an LED (c) a water pump (d) a sound sensor
  26. 26.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  27. 27.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an output? (a) a keypad (b) a turning knob (c) a motion sensor (d) a water pump
  30. 30.Which of these is an input? (a) a motor (b) a temperature sensor (c) a small display (d) a speaker
  31. 31.🔌 Is a small display 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.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a motion sensor (d) a servo motor
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 Digital or analog: the room temperature? (a) digital (b) analog
  37. 37.💡 An LED (with its resistor) is on pin 7. 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
  38. 38.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a push button (d) a keypad
  39. 39.💡 An LED (with its resistor) is on pin 7. 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
  40. 40.💡 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

Answer key

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

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