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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 627 · 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.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.📶 Digital or analog: the room temperature? (a) digital (b) analog
  4. 4.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  5. 5.Which of these is an input? (a) a push button (b) a water pump (c) a servo motor (d) a motor
  6. 6.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  7. 7.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a keypad (d) a buzzer
  8. 8.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  9. 9.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a motor (d) a keypad
  11. 11.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.True or false: “many values in a range” is a digital signal. (a) False (b) True
  13. 13.💡 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
  14. 14.Which of these is an input? (a) an LED (b) a water pump (c) a motion sensor (d) a motor
  15. 15.💡 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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) an LED (d) a motion sensor
  18. 18.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a turning knob (d) a water pump
  19. 19.Which of these is an input? (a) a servo motor (b) a light sensor (c) a water pump (d) an LED
  20. 20.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  22. 22.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.Which of these is an input? (a) a small display (b) a buzzer (c) a motor (d) a turning knob
  26. 26.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔍 Which is the odd one out? (a) a small display (b) a temperature sensor (c) a speaker (d) a servo motor
  28. 28.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  33. 33.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  34. 34.💡 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 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  36. 36.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.Which of these is an input? (a) a temperature sensor (b) an LED (c) a small display (d) a speaker
  40. 40.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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

Answer key

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

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