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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 275 · 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.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  2. 2.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  4. 4.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  6. 6.True or false: “the room temperature” is a digital signal. (a) False (b) True
  7. 7.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.Which of these is an input? (a) a servo motor (b) a motion sensor (c) a motor (d) a small display
  9. 9.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an input? (a) a light sensor (b) a water pump (c) a buzzer (d) a small display
  11. 11.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  13. 13.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  14. 14.💡 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 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  18. 18.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a buzzer (d) an LED
  21. 21.💡 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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.Which of these is an output? (a) a water pump (b) a sound sensor (c) a turning knob (d) a temperature sensor
  23. 23.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
  24. 24.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  25. 25.Which of these is an output? (a) a buzzer (b) a temperature sensor (c) a motion sensor (d) a turning knob
  26. 26.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  27. 27.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  28. 28.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  29. 29.True or false: “many values in a range” is a digital signal. (a) False (b) True
  30. 30.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  31. 31.💡 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) OFF (b) ON
  32. 32.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  34. 34.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  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 8 LOW
    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 sound sensor (b) a temperature sensor (c) a turning knob (d) a small display
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an output? (a) a keypad (b) a servo motor (c) a turning knob (d) a push button

Answer key

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

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