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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 211 · 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 an LED an input or an output for a microcontroller? (a) input (b) output
  2. 2.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  4. 4.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a water pump (d) an LED
  5. 5.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a keypad (d) a light sensor
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an output? (a) a light sensor (b) a push button (c) a motor (d) a sound sensor
  10. 10.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a light sensor (d) a water pump
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  12. 12.📶 Digital or analog: the room temperature? (a) digital (b) analog
  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.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  15. 15.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  16. 16.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) an LED (d) a keypad
  17. 17.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  18. 18.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “many values in a range” is a digital signal. (a) False (b) True
  21. 21.Which of these is an input? (a) a servo motor (b) a small display (c) a buzzer (d) a sound sensor
  22. 22.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an output? (a) a push button (b) a turning knob (c) a water pump (d) a light sensor
  24. 24.Which of these is an output? (a) a speaker (b) a keypad (c) a temperature sensor (d) a light sensor
  25. 25.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  26. 26.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an input? (a) a servo motor (b) a motor (c) a turning knob (d) a speaker
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a keypad (d) a small display
  29. 29.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  30. 30.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a water pump (d) a temperature sensor
  32. 32.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a small display (d) a temperature sensor
  34. 34.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  35. 35.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  37. 37.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  38. 38.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  39. 39.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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