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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 810 · 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 speaker (b) a motion sensor (c) a light sensor (d) a temperature sensor
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  3. 3.💡 An LED (with its resistor) is on pin 7. 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
  4. 4.Which of these is an output? (a) a turning knob (b) a sound sensor (c) a temperature sensor (d) an LED
  5. 5.💡 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
  6. 6.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  7. 7.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  8. 8.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a speaker (d) a servo motor
  9. 9.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  10. 10.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  13. 13.Which of these is an output? (a) a keypad (b) a motion sensor (c) a push button (d) a buzzer
  14. 14.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a motor (d) a sound sensor
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  18. 18.Which of these is an input? (a) a push button (b) a speaker (c) a water pump (d) a small display
  19. 19.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 Digital or analog: many values in a range? (a) analog (b) digital
  22. 22.Which of these is an input? (a) an LED (b) a speaker (c) a turning knob (d) a motor
  23. 23.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  24. 24.Which of these is an input? (a) an LED (b) a servo motor (c) a small display (d) a keypad
  25. 25.Which of these is an input? (a) a small display (b) a water pump (c) a buzzer (d) a sound sensor
  26. 26.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a water pump
  28. 28.True or false: “many values in a range” is a digital signal. (a) True (b) False
  29. 29.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  30. 30.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  31. 31.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a push button
  34. 34.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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