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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 560 · 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 output? (a) a light sensor (b) a motor (c) a temperature sensor (d) a keypad
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  3. 3.Which of these is an input? (a) a buzzer (b) a keypad (c) a motor (d) a speaker
  4. 4.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  5. 5.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a keypad (d) a servo motor
  7. 7.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.📶 Digital or analog: the room temperature? (a) digital (b) analog
  15. 15.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a keypad (d) a servo motor
  17. 17.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  18. 18.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a push button (d) a buzzer
  19. 19.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  20. 20.Which of these is an input? (a) a light sensor (b) a small display (c) a buzzer (d) a servo motor
  21. 21.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 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
  23. 23.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  24. 24.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  29. 29.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  30. 30.Which of these is an input? (a) a sound sensor (b) a small display (c) an LED (d) a servo motor
  31. 31.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  33. 33.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  38. 38.💡 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) OFF (b) ON
  39. 39.💡 An LED (with its resistor) is on pin 8. 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
  40. 40.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital

Answer key

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

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