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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 715 · 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 push button an input or an output for a microcontroller? (a) input (b) output
  2. 2.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a turning knob (d) a push button
  4. 4.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  8. 8.💡 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) OFF (b) ON
  9. 9.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a motor (b) an LED (c) a speaker (d) a keypad
  11. 11.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a turning knob (d) a water pump
  12. 12.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  13. 13.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  14. 14.📶 Digital or analog: the room temperature? (a) digital (b) analog
  15. 15.Which of these is an input? (a) a water pump (b) a motor (c) a turning knob (d) a buzzer
  16. 16.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  17. 17.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  18. 18.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  19. 19.📶 Digital or analog: many values in a range? (a) digital (b) analog
  20. 20.True or false: “how loud a sound is” is a digital 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  23. 23.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  24. 24.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a light sensor
  25. 25.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a water pump (d) a servo motor
  26. 26.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  27. 27.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  28. 28.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a small display (d) a push button
  30. 30.Which of these is an output? (a) a push button (b) a keypad (c) a speaker (d) a light sensor
  31. 31.📶 How many states can a digital pin have? (a) one (b) ten (c) two (d) a thousand
  32. 32.Which of these is an input? (a) a servo motor (b) a sound sensor (c) a speaker (d) a buzzer
  33. 33.💡 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
  34. 34.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  36. 36.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a keypad (d) a light sensor
  37. 37.Which of these is an output? (a) a motor (b) a turning knob (c) a push button (d) a temperature sensor
  38. 38.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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