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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 77 · 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 motor an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  3. 3.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  5. 5.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  6. 6.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  7. 7.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a keypad (d) an LED
  8. 8.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  9. 9.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  10. 10.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  11. 11.📶 Digital or analog: many values in a range? (a) digital (b) analog
  12. 12.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a sound sensor (d) a turning knob
  13. 13.Which of these is an output? (a) a servo motor (b) a keypad (c) a sound sensor (d) a turning knob
  14. 14.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  15. 15.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a speaker (d) a keypad
  16. 16.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  18. 18.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  23. 23.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  24. 24.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a speaker
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.📶 Digital or analog: the room temperature? (a) analog (b) digital
  27. 27.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  28. 28.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.True or false: “the room temperature” is a digital signal. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) a water pump (b) a motor (c) an LED (d) a temperature sensor
  31. 31.💡 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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.💡 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) OFF (b) ON
  33. 33.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a speaker (d) a light sensor
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 5 V (d) 1.5 V
  38. 38.💡 An LED (with its resistor) is on pin 7. 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
  39. 39.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an input? (a) a motor (b) a small display (c) a temperature sensor (d) a water pump

Answer key

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

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