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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 551 · 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.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  2. 2.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  3. 3.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  4. 4.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  7. 7.🔍 Which is the odd one out? (a) a temperature sensor (b) a turning knob (c) a motor (d) a keypad
  8. 8.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a temperature sensor (d) a water pump
  9. 9.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON
  10. 10.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  11. 11.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a buzzer (d) a push button
  13. 13.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  15. 15.💡 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
    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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a water pump (d) a small display
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a water pump (b) a buzzer (c) a servo motor (d) a light 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 7 HIGH
    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
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  24. 24.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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) ON (b) OFF
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an input? (a) a small display (b) a speaker (c) a sound sensor (d) a water pump
  29. 29.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  30. 30.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  31. 31.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a buzzer (d) a servo motor
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.🔍 Which is the odd one out? (a) a keypad (b) an LED (c) a turning knob (d) a push button
  34. 34.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a speaker (d) a light sensor
  35. 35.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.💡 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) OFF (b) ON
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  39. 39.True or false: “many values in a range” is a digital signal. (a) True (b) False
  40. 40.💡 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 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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