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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 468 · 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 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) OFF (b) ON
  2. 2.🔍 Which is the odd one out? (a) a temperature sensor (b) a turning knob (c) a motion sensor (d) a speaker
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.Which of these is an input? (a) a speaker (b) a push button (c) a buzzer (d) a water pump
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a buzzer (d) a servo motor
  9. 9.Which of these is an input? (a) an LED (b) a servo motor (c) a buzzer (d) a turning knob
  10. 10.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  11. 11.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  13. 13.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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) OFF (b) ON
  15. 15.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  16. 16.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a water pump (d) a motion sensor
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an input? (a) a buzzer (b) a motor (c) a sound sensor (d) a small display
  19. 19.🔍 Which is the odd one out? (a) a motion sensor (b) an LED (c) a servo motor (d) a speaker
  20. 20.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a buzzer (d) a push button
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  23. 23.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an output? (a) a servo motor (b) a light sensor (c) a temperature sensor (d) a push button
  28. 28.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a speaker (d) a turning knob
  29. 29.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  31. 31.Which of these is an input? (a) an LED (b) a motion sensor (c) a small display (d) a buzzer
  32. 32.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  33. 33.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
  35. 35.💡 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
  36. 36.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a turning knob (d) a temperature sensor
  37. 37.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  38. 38.Which of these is an output? (a) an LED (b) a turning knob (c) a light sensor (d) a sound sensor
  39. 39.💡 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
  40. 40.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a servo motor (d) an LED

Answer key

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

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