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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 381 · 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 an LED an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  3. 3.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) an LED (d) a light sensor
  7. 7.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  8. 8.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a servo motor (d) a sound sensor
  10. 10.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  11. 11.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  12. 12.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.💡 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) OFF (b) ON
  14. 14.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  16. 16.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  17. 17.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a motion sensor (d) a temperature sensor
  18. 18.💡 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 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  20. 20.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  21. 21.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a speaker (d) a sound sensor
  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 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.Which of these is an input? (a) a water pump (b) a light sensor (c) an LED (d) a small display
  25. 25.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a sound sensor (d) an LED
  27. 27.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  28. 28.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  29. 29.Which of these is an input? (a) a servo motor (b) a speaker (c) an LED (d) a keypad
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a light sensor (d) a sound sensor
  34. 34.True or false: “the room temperature” is a digital signal. (a) True (b) False
  35. 35.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a push button 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔍 Which is the odd one out? (a) a motion sensor (b) a buzzer (c) a servo motor (d) a motor
  40. 40.Which of these is an input? (a) a sound sensor (b) an LED (c) a buzzer (d) a motor

Answer key

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

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