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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 935 · 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 is the odd one out? (a) a servo motor (b) a motion sensor (c) a small display (d) an LED
  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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  4. 4.Which of these is an output? (a) a small display (b) a turning knob (c) a temperature sensor (d) a keypad
  5. 5.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) an LED (d) a buzzer
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) an LED (d) a motor
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.Which of these is an input? (a) a motion sensor (b) a small display (c) a buzzer (d) a speaker
  12. 12.True or false: “the room temperature” is an analog signal. (a) False (b) True
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  14. 14.📶 Digital or analog: the room temperature? (a) analog (b) digital
  15. 15.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a sound sensor (d) a push button
  18. 18.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  19. 19.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  20. 20.Which of these is an output? (a) a keypad (b) a light sensor (c) a motion sensor (d) a buzzer
  21. 21.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  22. 22.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  23. 23.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a servo motor (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 7 HIGH
    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
  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 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  27. 27.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “many values in a range” is an analog signal. (a) False (b) True
  31. 31.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  32. 32.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  33. 33.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  35. 35.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  37. 37.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  39. 39.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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