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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 731 · 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 input? (a) a water pump (b) a motor (c) a motion sensor (d) an LED
  2. 2.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  3. 3.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  4. 4.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.Which of these is an input? (a) a temperature sensor (b) a servo motor (c) a motor (d) an LED
  7. 7.Which of these is an input? (a) a water pump (b) a motor (c) a servo motor (d) a light sensor
  8. 8.💡 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) OFF (b) ON
  9. 9.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  10. 10.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  11. 11.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  13. 13.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  14. 14.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a motor (d) a servo motor
  15. 15.💡 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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.Which of these is an output? (a) a keypad (b) a light sensor (c) a sound sensor (d) a speaker
  17. 17.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  18. 18.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) a keypad (d) a water pump
  19. 19.🔍 Which is the odd one out? (a) a speaker (b) a temperature sensor (c) a motor (d) a buzzer
  20. 20.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  23. 23.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  24. 24.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  26. 26.Which of these is an input? (a) an LED (b) a water pump (c) a keypad (d) a speaker
  27. 27.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  28. 28.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  29. 29.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “the room temperature” is a digital signal. (a) True (b) False
  31. 31.💡 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 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an input? (a) an LED (b) a push button (c) a small display (d) a speaker
  33. 33.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  35. 35.True or false: “the room temperature” is an analog signal. (a) False (b) True
  36. 36.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  38. 38.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  39. 39.Which of these is an input? (a) a speaker (b) a sound sensor (c) a water pump (d) an LED
  40. 40.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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