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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 760 · 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 speaker (c) a small display (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 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  4. 4.💡 An LED (with its resistor) is on pin 8. 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
  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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.Which of these is an input? (a) a speaker (b) a buzzer (c) a servo motor (d) a light sensor
  7. 7.🔍 Which is the odd one out? (a) a motor (b) a push button (c) an LED (d) a buzzer
  8. 8.📶 Digital or analog: the room temperature? (a) analog (b) digital
  9. 9.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  12. 12.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  14. 14.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a speaker (d) a sound sensor
  16. 16.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  17. 17.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.True or false: “the room temperature” 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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  23. 23.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  24. 24.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a motor (d) an LED
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.🔍 Which is the odd one out? (a) a push button (b) a small display (c) a light sensor (d) a temperature sensor
  28. 28.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  31. 31.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a servo motor (d) a temperature sensor
  32. 32.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a push button (b) a small display (c) a temperature sensor (d) a sound sensor
  34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  37. 37.Which of these is an output? (a) a light sensor (b) a turning knob (c) a keypad (d) a water pump
  38. 38.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  39. 39.Which of these is an input? (a) a speaker (b) a servo motor (c) an LED (d) a motion sensor
  40. 40.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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