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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 802 · 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 of these is an input? (a) a small display (b) a speaker (c) a buzzer (d) a light sensor
  2. 2.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an output? (a) a keypad (b) a push button (c) a small display (d) a motion sensor
  4. 4.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a turning knob (d) a water pump
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 Digital or analog: the room temperature? (a) analog (b) digital
  7. 7.Which of these is an input? (a) a turning knob (b) a buzzer (c) a servo motor (d) a small display
  8. 8.Which of these is an output? (a) a temperature sensor (b) a water pump (c) a keypad (d) a motion sensor
  9. 9.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) an LED (d) a servo motor
  10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an input? (a) a temperature sensor (b) an LED (c) a speaker (d) a water pump
  12. 12.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  14. 14.🔍 Which is the odd one out? (a) an LED (b) a water pump (c) a small display (d) a turning knob
  15. 15.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  16. 16.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  18. 18.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a keypad (d) a light sensor
  19. 19.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  22. 22.🔍 Which is the odd one out? (a) a motor (b) a servo motor (c) an LED (d) a push button
  23. 23.Which of these is an input? (a) a buzzer (b) an LED (c) a water pump (d) a push button
  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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a temperature sensor (d) an LED
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.📶 Digital or analog: many values in a range? (a) digital (b) analog
  30. 30.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  31. 31.Which of these is an output? (a) a keypad (b) a motion sensor (c) a turning knob (d) a speaker
  32. 32.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  33. 33.Which of these is an input? (a) a speaker (b) a water pump (c) an LED (d) a keypad
  34. 34.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  36. 36.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  37. 37.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a temperature sensor (d) a sound sensor
  38. 38.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  39. 39.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a keypad
  40. 40.Which of these is an input? (a) a small display (b) a buzzer (c) a speaker (d) a sound sensor

Answer key

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

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