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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 344 · 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 of these is an output? (a) a push button (b) a water pump (c) a light sensor (d) a motion sensor
  2. 2.🔍 Which is the odd one out? (a) a servo motor (b) a sound sensor (c) an LED (d) a buzzer
  3. 3.📶 Digital or analog: many values in a range? (a) analog (b) digital
  4. 4.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  5. 5.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  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 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  8. 8.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) an LED (d) a light sensor
  9. 9.📶 How many states can a digital pin have? (a) a thousand (b) two (c) ten (d) one
  10. 10.💡 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
  11. 11.Which of these is an output? (a) a motion sensor (b) a push button (c) a speaker (d) a turning knob
  12. 12.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a motor (d) a sound sensor
  17. 17.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an input? (a) a motor (b) a small display (c) a sound sensor (d) an LED
  20. 20.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  21. 21.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  24. 24.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  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
    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 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  30. 30.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) an LED (d) a motion sensor
  31. 31.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  32. 32.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.Which of these is an output? (a) a turning knob (b) a motor (c) a keypad (d) a motion sensor
  35. 35.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an output? (a) a turning knob (b) an LED (c) a light sensor (d) a temperature sensor
  37. 37.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a servo motor (d) a push button
  40. 40.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a turning knob (d) an LED

Answer key

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

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