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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 727 · 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a small display (d) a servo motor
  3. 3.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a turning knob (d) a keypad
  4. 4.Which of these is an output? (a) a sound sensor (b) a small display (c) a light sensor (d) a push button
  5. 5.📶 Digital or analog: the room temperature? (a) analog (b) digital
  6. 6.Which of these is an input? (a) a servo motor (b) a speaker (c) an LED (d) a push button
  7. 7.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.Which of these is an input? (a) a servo motor (b) a buzzer (c) a motor (d) a keypad
  9. 9.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a buzzer (d) a small display
  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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.Which of these is an output? (a) an LED (b) a motion sensor (c) a push button (d) a sound sensor
  12. 12.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a temperature sensor (d) a servo motor
  15. 15.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  17. 17.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  18. 18.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.Which of these is an input? (a) a buzzer (b) a speaker (c) a light sensor (d) a motor
  20. 20.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  22. 22.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  25. 25.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  26. 26.Which of these is an output? (a) a push button (b) a keypad (c) a light sensor (d) a speaker
  27. 27.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  28. 28.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a push button (d) a sound sensor
  30. 30.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  31. 31.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  35. 35.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  36. 36.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  38. 38.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔍 Which is the odd one out? (a) a light sensor (b) a speaker (c) a temperature sensor (d) a sound sensor
  40. 40.Which of these is an input? (a) a servo motor (b) an LED (c) a speaker (d) a temperature sensor

Answer key

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

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