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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 391 · 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.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  2. 2.Which of these is an output? (a) a buzzer (b) a light sensor (c) a motion sensor (d) a turning knob
  3. 3.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  6. 6.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  7. 7.💡 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
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a water pump (d) an LED
  9. 9.Which of these is an input? (a) a servo motor (b) an LED (c) a motion sensor (d) a water pump
  10. 10.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a light sensor (d) an LED
  11. 11.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  12. 12.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  13. 13.💡 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
  14. 14.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  15. 15.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  16. 16.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  17. 17.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.True or false: “many values in a range” is an analog signal. (a) False (b) True
  19. 19.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a sound sensor (d) an LED
  20. 20.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  21. 21.💡 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
  22. 22.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  23. 23.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a motor (d) a water pump
  24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.Which of these is an output? (a) a keypad (b) a push button (c) a servo motor (d) a temperature sensor
  26. 26.📶 Digital or analog: many values in a range? (a) analog (b) digital
  27. 27.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  28. 28.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  29. 29.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  30. 30.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  31. 31.💡 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
    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 7. 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) OFF (b) ON
  33. 33.💡 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 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  35. 35.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  36. 36.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a push button (d) a speaker
  37. 37.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a servo motor (d) a small display
  38. 38.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) a turning knob (d) a temperature sensor
  39. 39.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a motor (d) a keypad
  40. 40.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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