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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 99 · 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.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  2. 2.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a keypad (d) a turning knob
  5. 5.Which of these is an output? (a) a push button (b) a temperature sensor (c) a sound sensor (d) a speaker
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  7. 7.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.Which of these is an input? (a) a small display (b) an LED (c) a light sensor (d) a speaker
  9. 9.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  10. 10.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a keypad (d) a push button
  11. 11.📶 Digital or analog: many values in a range? (a) analog (b) digital
  12. 12.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a water pump (d) a temperature sensor
  13. 13.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a water pump (d) an LED
  14. 14.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a water pump (d) a push button
  15. 15.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  16. 16.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an input? (a) a motor (b) a small display (c) a motion sensor (d) a servo motor
  22. 22.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  23. 23.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    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 LOW
    set pin 7 HIGH
    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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  30. 30.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  31. 31.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  32. 32.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  34. 34.Which of these is an output? (a) a motion sensor (b) a keypad (c) a light sensor (d) a buzzer
  35. 35.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  36. 36.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  37. 37.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  38. 38.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔍 Which is the odd one out? (a) a push button (b) an LED (c) a motion sensor (d) a light sensor
  40. 40.True or false: “how bright a room is” is an analog signal. (a) False (b) True

Answer key

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

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