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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 893 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  2. 2.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a sound sensor (d) a turning knob
  4. 4.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) an LED (d) a water pump
  8. 8.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a motor (d) an LED
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a turning knob (d) a motor
  10. 10.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  11. 11.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  12. 12.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  13. 13.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  14. 14.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  15. 15.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a push button (d) a servo motor
  16. 16.Which of these is an output? (a) a temperature sensor (b) an LED (c) a keypad (d) a turning knob
  17. 17.Which of these is an output? (a) a push button (b) a water pump (c) a sound sensor (d) a temperature sensor
  18. 18.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  19. 19.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  20. 20.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a motor (d) a temperature sensor
  21. 21.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.💡 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
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an input? (a) an LED (b) a buzzer (c) a light sensor (d) a motor
  29. 29.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: the room temperature? (a) analog (b) digital
  32. 32.Which of these is an input? (a) a motion sensor (b) a small display (c) an LED (d) a speaker
  33. 33.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  34. 34.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  35. 35.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.Which of these is an input? (a) a servo motor (b) a sound sensor (c) an LED (d) a water pump
  38. 38.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a light sensor (d) a keypad

Answer key

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

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