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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 115 · 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.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  2. 2.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  3. 3.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  5. 5.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  6. 6.Which of these is an output? (a) an LED (b) a light sensor (c) a motion sensor (d) a push button
  7. 7.True or false: “the room temperature” is a digital signal. (a) True (b) False
  8. 8.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a speaker (d) a light sensor
  9. 9.🔍 Which is the odd one out? (a) a keypad (b) a speaker (c) a water pump (d) a servo motor
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    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
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a motor (d) a servo motor
  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 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
  17. 17.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  18. 18.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a light sensor (d) a buzzer
  19. 19.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a keypad (d) a push button
  20. 20.💡 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
  21. 21.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  22. 22.Which of these is an output? (a) a keypad (b) a servo motor (c) a turning knob (d) a temperature sensor
  23. 23.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  25. 25.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) an LED (d) a temperature sensor
  26. 26.Which of these is an input? (a) a speaker (b) a servo motor (c) a turning knob (d) a small display
  27. 27.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output
  28. 28.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  29. 29.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  31. 31.🔌 Is a small display 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  34. 34.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  35. 35.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a servo motor (d) a sound sensor
  36. 36.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  37. 37.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a servo motor (d) a light sensor
  40. 40.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a temperature sensor (d) a small display

Answer key

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

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