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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 198 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  2. 2.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  3. 3.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  4. 4.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  5. 5.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a small display (d) a light sensor
  6. 6.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a temperature sensor (d) an LED
  7. 7.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  8. 8.True or false: “the room temperature” is a digital signal. (a) True (b) False
  9. 9.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.💡 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
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output
  13. 13.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a water pump (d) a temperature sensor
  14. 14.💡 An LED (with its resistor) is on pin 7. 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
  15. 15.True or false: “HIGH or LOW only” is a digital 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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.Which of these is an input? (a) a small display (b) a servo motor (c) a push button (d) a buzzer
  18. 18.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a motion sensor (d) a light sensor
  19. 19.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  20. 20.💡 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
  21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a keypad (d) a motor
  22. 22.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a motor (d) a servo motor
  23. 23.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  24. 24.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.📶 Digital or analog: HIGH or LOW only? (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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  32. 32.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a keypad (d) a motion sensor
  33. 33.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  35. 35.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an output? (a) an LED (b) a light sensor (c) a push button (d) a motion sensor
  37. 37.True or false: “the room temperature” is an analog signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a push button (b) a water pump (c) a turning knob (d) a light sensor
  39. 39.Which of these is an input? (a) an LED (b) a speaker (c) a keypad (d) a motor
  40. 40.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True

Answer key

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

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