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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 480 · 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.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  3. 3.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  5. 5.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a water pump (d) a light sensor
  6. 6.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  7. 7.Which of these is an input? (a) a speaker (b) a water pump (c) a light sensor (d) a servo motor
  8. 8.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) a push button (d) a buzzer
  10. 10.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an output? (a) a buzzer (b) a keypad (c) a temperature sensor (d) a light sensor
  12. 12.📶 Digital or analog: many values in a range? (a) digital (b) analog
  13. 13.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  15. 15.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an output? (a) a turning knob (b) a light sensor (c) a motor (d) a motion sensor
  18. 18.Which of these is an output? (a) a water pump (b) a light sensor (c) a turning knob (d) a push button
  19. 19.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  20. 20.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a sound sensor (d) an LED
  21. 21.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.Which of these is an output? (a) a temperature sensor (b) a small display (c) a push button (d) a light sensor
  23. 23.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    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
  26. 26.💡 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
  27. 27.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a motion sensor (d) a sound sensor
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  29. 29.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  30. 30.Which of these is an output? (a) a push button (b) a keypad (c) an LED (d) a sound sensor
  31. 31.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 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 is the odd one out? (a) a water pump (b) a light sensor (c) a sound sensor (d) a keypad
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  36. 36.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  37. 37.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  39. 39.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a push button (d) a servo motor

Answer key

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

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