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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 332 · 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: a door: open or shut? (a) digital (b) analog
  2. 2.💡 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) OFF (b) ON
  3. 3.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 An LED (with its resistor) is on pin 7. 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
  5. 5.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a keypad (d) a push button
  6. 6.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  7. 7.📶 Digital or analog: many values in a range? (a) digital (b) analog
  8. 8.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  12. 12.Which of these is an input? (a) an LED (b) a buzzer (c) a water pump (d) a temperature sensor
  13. 13.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “the room temperature” is a digital 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  20. 20.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  23. 23.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a push button (d) a motor
  24. 24.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  25. 25.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.Which of these is an output? (a) a turning knob (b) a servo motor (c) a light sensor (d) a push button
  27. 27.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  29. 29.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  30. 30.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  34. 34.Which of these is an output? (a) a light sensor (b) a speaker (c) a temperature sensor (d) a sound sensor
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a servo motor (d) a speaker
  36. 36.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  37. 37.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  38. 38.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  40. 40.True or false: “a door: open or shut” is a digital signal. (a) False (b) True

Answer key

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

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