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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 666 · 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.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  2. 2.Which of these is an input? (a) a push button (b) a small display (c) a buzzer (d) a servo motor
  3. 3.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a speaker (d) a small display
  4. 4.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  7. 7.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  8. 8.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a light sensor (d) a sound sensor
  9. 9.💡 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 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a water pump (d) a light sensor
  11. 11.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  12. 12.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  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 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  16. 16.Which of these is an output? (a) a sound sensor (b) a water pump (c) a temperature sensor (d) a motion sensor
  17. 17.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  18. 18.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  19. 19.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  20. 20.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    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
  22. 22.Which of these is an output? (a) a push button (b) a light sensor (c) a temperature sensor (d) a buzzer
  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 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 7. 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
  25. 25.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a light sensor (d) a temperature sensor
  27. 27.💡 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) ON (b) OFF
  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 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  30. 30.True or false: “many values in a range” is an analog signal. (a) False (b) True
  31. 31.True or false: “the room temperature” is an analog signal. (a) True (b) False
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an input? (a) a speaker (b) an LED (c) a servo motor (d) a light sensor
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.Which of these is an input? (a) a buzzer (b) a small display (c) a motion sensor (d) a servo motor
  36. 36.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a motion sensor (d) a sound sensor
  37. 37.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a speaker (d) a push button
  39. 39.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V

Answer key

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

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