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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 256 · 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 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  3. 3.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a motor (d) a light sensor
  4. 4.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  5. 5.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a servo motor
  6. 6.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  7. 7.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  8. 8.💡 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
  9. 9.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a sound sensor (d) a small display
  11. 11.💡 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) ON (b) OFF
  12. 12.💡 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
  13. 13.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  14. 14.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a motion sensor (d) a turning knob
  19. 19.Which of these is an output? (a) a push button (b) a keypad (c) a light sensor (d) an LED
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a turning knob (d) a push button
  22. 22.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  23. 23.📶 Digital or analog: the room temperature? (a) digital (b) analog
  24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a light sensor (d) a small display
  26. 26.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  27. 27.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  29. 29.💡 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
    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
  30. 30.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an output? (a) a motion sensor (b) a motor (c) a light sensor (d) a temperature sensor
  32. 32.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a light sensor (b) a turning knob (c) a sound sensor (d) a small display
  34. 34.Which of these is an input? (a) a water pump (b) an LED (c) a buzzer (d) a temperature sensor
  35. 35.Which of these is an input? (a) a servo motor (b) a small display (c) a push button (d) a water pump
  36. 36.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  37. 37.True or false: “many values in a range” is a digital signal. (a) True (b) False
  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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.📶 Digital or analog: a door: open or shut? (a) analog (b) digital

Answer key

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

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