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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 871 · 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 buzzer an input or an output for a microcontroller? (a) input (b) output
  2. 2.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a turning knob (d) an LED
  3. 3.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a servo motor (d) a sound sensor
  4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  6. 6.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  7. 7.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a temperature sensor (d) a water pump
  10. 10.Which of these is an input? (a) an LED (b) a speaker (c) a motion sensor (d) a small display
  11. 11.💡 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) OFF (b) ON
  12. 12.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  13. 13.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  15. 15.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  16. 16.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a servo motor (d) a push button
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.Which of these is an input? (a) an LED (b) a water pump (c) a small display (d) a keypad
  21. 21.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  25. 25.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  26. 26.📶 Digital or analog: the room temperature? (a) analog (b) digital
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a servo motor (b) a speaker (c) an LED (d) a push button
  29. 29.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a water pump (d) a motion sensor
  30. 30.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  31. 31.Which of these is an input? (a) a water pump (b) a servo motor (c) an LED (d) a light sensor
  32. 32.True or false: “many values in a range” is a digital signal. (a) False (b) True
  33. 33.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  35. 35.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a motor (d) a light sensor
  37. 37.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  38. 38.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  39. 39.Which of these is an output? (a) a light sensor (b) a push button (c) a speaker (d) a sound sensor
  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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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