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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 803 · 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 is the odd one out? (a) a small display (b) a temperature sensor (c) a buzzer (d) an LED
  2. 2.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  3. 3.Which of these is an output? (a) a push button (b) a keypad (c) a sound sensor (d) a speaker
  4. 4.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  5. 5.📶 Digital or analog: many values in a range? (a) analog (b) digital
  6. 6.True or false: “the room temperature” is a digital signal. (a) False (b) True
  7. 7.Which of these is an input? (a) a speaker (b) a sound sensor (c) a small display (d) a motor
  8. 8.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a turning knob (d) a push button
  11. 11.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  14. 14.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  15. 15.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  16. 16.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  17. 17.Which of these is an output? (a) a light sensor (b) a water pump (c) a push button (d) a keypad
  18. 18.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a water pump (d) a turning knob
  19. 19.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) an LED (d) a buzzer
  20. 20.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  21. 21.💡 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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a water pump (d) an LED
  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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a keypad (d) an LED
  25. 25.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.💡 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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a sound sensor (d) a keypad
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a sound sensor (c) a servo motor (d) an LED
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  36. 36.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  37. 37.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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