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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 742 · 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 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 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 motor (b) a temperature sensor (c) a speaker (d) a small display
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a turning knob (d) a small display
  4. 4.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) an LED (d) a water pump
  5. 5.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  6. 6.🔍 Which is the odd one out? (a) a speaker (b) a keypad (c) a servo motor (d) a buzzer
  7. 7.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.True or false: “many values in a range” is a digital signal. (a) False (b) True
  10. 10.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a servo motor (d) a keypad
  13. 13.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  14. 14.Which of these is an input? (a) a buzzer (b) a light sensor (c) a servo motor (d) a motor
  15. 15.📶 Digital or analog: many values in a range? (a) digital (b) analog
  16. 16.Which of these is an input? (a) an LED (b) a buzzer (c) a speaker (d) a turning knob
  17. 17.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  18. 18.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  19. 19.Which of these is an output? (a) a turning knob (b) a water pump (c) a keypad (d) a sound sensor
  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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  22. 22.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  23. 23.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  24. 24.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  25. 25.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a motion sensor (d) a servo motor
  27. 27.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  28. 28.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  29. 29.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  30. 30.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  31. 31.Which of these is an input? (a) a motor (b) a buzzer (c) a keypad (d) a water pump
  32. 32.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) an LED (d) a push button
  33. 33.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a speaker (d) a motion sensor
  34. 34.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a buzzer (d) a sound sensor
  37. 37.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a motor (d) a water pump
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a light sensor (d) a keypad

Answer key

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

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