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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 671 · 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 motion sensor (b) a temperature sensor (c) a buzzer (d) a keypad
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a motor (d) a motion sensor
  6. 6.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 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
  7. 7.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 Digital or analog: many values in a range? (a) analog (b) digital
  14. 14.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  15. 15.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  17. 17.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  18. 18.🔍 Which is the odd one out? (a) a servo motor (b) a keypad (c) a buzzer (d) a small display
  19. 19.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  22. 22.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.True or false: “many values in a range” is an analog signal. (a) False (b) True
  25. 25.💡 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) OFF (b) ON
  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 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.🔌 Is a motor 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    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 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a turning knob (d) a speaker
  31. 31.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a water pump
  32. 32.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a sound sensor (b) a push button (c) a keypad (d) an LED
  34. 34.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a small display (d) a push button
  35. 35.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  36. 36.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a keypad (d) a push button
  37. 37.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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
  39. 39.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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