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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 301 · 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.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  2. 2.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a motion sensor (d) a water pump
  3. 3.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a speaker (d) a push button
  4. 4.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  6. 6.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a servo motor (d) a light sensor
  7. 7.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a motor (d) an LED
  8. 8.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a motor (d) a servo motor
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.📶 Digital or analog: many values in a range? (a) analog (b) digital
  11. 11.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  12. 12.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  13. 13.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.Which of these is an output? (a) a temperature sensor (b) a push button (c) a turning knob (d) a water pump
  19. 19.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a speaker (d) a push button
  20. 20.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a small display (d) a turning knob
  21. 21.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  22. 22.Which of these is an input? (a) a small display (b) a sound sensor (c) an LED (d) a servo motor
  23. 23.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  26. 26.Which of these is an input? (a) a push button (b) a motor (c) a buzzer (d) an LED
  27. 27.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a motion sensor (d) a turning knob
  28. 28.💡 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) ON (b) OFF
  29. 29.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) an LED (d) a motor
  30. 30.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  31. 31.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a small display (d) a sound sensor
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  35. 35.True or false: “the room temperature” is an analog signal. (a) False (b) True
  36. 36.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  37. 37.💡 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) ON (b) OFF
  38. 38.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.True or false: “many values in a range” is a digital signal. (a) True (b) False

Answer key

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

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