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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 180 · 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 is the odd one out? (a) a turning knob (b) a temperature sensor (c) a motor (d) a keypad
  2. 2.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  3. 3.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  4. 4.Which of these is an input? (a) a motor (b) a sound sensor (c) an LED (d) a water pump
  5. 5.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.True or false: “a knob turned part way” is an analog 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 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.Which of these is an output? (a) a temperature sensor (b) a speaker (c) a motion sensor (d) a turning knob
  10. 10.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  13. 13.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a keypad (d) an LED
  14. 14.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a motor (d) an LED
  18. 18.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  19. 19.Which of these is an output? (a) a motion sensor (b) a small display (c) a sound sensor (d) a light sensor
  20. 20.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  21. 21.Which of these is an input? (a) a servo motor (b) a motor (c) a motion sensor (d) an LED
  22. 22.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  23. 23.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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
  25. 25.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  27. 27.💡 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
    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
  28. 28.True or false: “many values in a range” is a digital signal. (a) False (b) True
  29. 29.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  30. 30.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “many values in a range” is an analog signal. (a) False (b) True
  32. 32.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an input? (a) a speaker (b) a light sensor (c) a buzzer (d) an LED
  34. 34.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  35. 35.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  37. 37.True or false: “the room temperature” is an analog signal. (a) False (b) True
  38. 38.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  40. 40.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output

Answer key

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

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