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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 708 · 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 sound sensor (b) a turning knob (c) a speaker (d) a push button
  2. 2.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a push button (d) a turning knob
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  5. 5.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  6. 6.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an input? (a) a motor (b) a servo motor (c) a buzzer (d) a motion sensor
  8. 8.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) an LED (d) a buzzer
  9. 9.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a small display (d) a push button
  10. 10.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  11. 11.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a light sensor (d) an LED
  14. 14.Which of these is an output? (a) a sound sensor (b) a keypad (c) a light sensor (d) a motor
  15. 15.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.True or false: “the room temperature” is an analog signal. (a) True (b) False
  17. 17.Which of these is an input? (a) a temperature sensor (b) a water pump (c) a motor (d) an LED
  18. 18.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a keypad (d) a motor
  20. 20.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  21. 21.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a sound sensor (d) a light sensor
  24. 24.Which of these is an input? (a) a servo motor (b) an LED (c) a push button (d) a small display
  25. 25.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an output? (a) a turning knob (b) a servo motor (c) a keypad (d) a motion sensor
  27. 27.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  30. 30.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 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
  33. 33.Which of these is an input? (a) a keypad (b) a servo motor (c) a water pump (d) an LED
  34. 34.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a motor (d) a temperature sensor
  35. 35.Which of these is an input? (a) a motor (b) a turning knob (c) a buzzer (d) a speaker
  36. 36.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  37. 37.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a motion sensor (d) an LED
  38. 38.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  39. 39.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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