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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 974 · 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 speaker (c) a servo motor (d) a light sensor
  2. 2.📶 Digital or analog: many values in a range? (a) digital (b) analog
  3. 3.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  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 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  7. 7.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a small display (d) a light sensor
  11. 11.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  12. 12.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a turning knob (d) a keypad
  13. 13.Which of these is an output? (a) a push button (b) a light sensor (c) a small display (d) a keypad
  14. 14.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) a small display (d) a water pump
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  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.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a servo motor (d) a motor
  22. 22.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an input? (a) an LED (b) a speaker (c) a keypad (d) a buzzer
  24. 24.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.True or false: “many values in a range” is an analog signal. (a) False (b) True
  26. 26.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.Which of these is an output? (a) a motion sensor (b) a servo motor (c) a light sensor (d) a keypad
  28. 28.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  29. 29.Which of these is an output? (a) a motion sensor (b) a push button (c) a water pump (d) a temperature sensor
  30. 30.Which of these is an input? (a) a motor (b) a servo motor (c) a small display (d) a push button
  31. 31.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  32. 32.Which of these is an input? (a) a buzzer (b) a water pump (c) a turning knob (d) a servo motor
  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 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “the room temperature” is a digital signal. (a) True (b) False
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) an LED (d) a turning knob
  36. 36.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  37. 37.💡 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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  39. 39.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  40. 40.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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