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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 888 · 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 temperature sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  4. 4.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  5. 5.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a water pump (d) a push button
  6. 6.Which of these is an input? (a) a push button (b) a speaker (c) a water pump (d) a buzzer
  7. 7.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a sound sensor (d) an LED
  8. 8.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a motor (d) a keypad
  9. 9.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 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
  10. 10.💡 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) OFF (b) ON
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  12. 12.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  13. 13.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  14. 14.Which of these is an input? (a) a water pump (b) a small display (c) a light sensor (d) a speaker
  15. 15.True or false: “many values in a range” is an analog signal. (a) False (b) True
  16. 16.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a turning knob (d) a small display
  17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  18. 18.💡 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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) an LED (d) a temperature sensor
  20. 20.💡 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 7 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 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.📶 Digital or analog: many values in a range? (a) digital (b) analog
  24. 24.Which of these is an output? (a) a sound sensor (b) a turning knob (c) a buzzer (d) a light sensor
  25. 25.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a turning knob (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 HIGH
    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
  27. 27.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  28. 28.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a light sensor (d) a motor
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  33. 33.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  34. 34.Which of these is an output? (a) a push button (b) a temperature sensor (c) a turning knob (d) an LED
  35. 35.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a speaker (d) a small display
  36. 36.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) an LED (d) a keypad
  37. 37.💡 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) OFF (b) ON
  38. 38.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  39. 39.True or false: “the room temperature” is an analog signal. (a) True (b) False
  40. 40.Which of these is an input? (a) a small display (b) a turning knob (c) a buzzer (d) a servo motor

Answer key

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

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