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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 973 · 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.💡 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) ON (b) OFF
  2. 2.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  4. 4.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a buzzer (d) a temperature sensor
  5. 5.📶 Digital or analog: many values in a range? (a) digital (b) analog
  6. 6.True or false: “the room temperature” is an analog signal. (a) False (b) True
  7. 7.💡 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 7 HIGH
    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 water pump (b) an LED (c) a motor (d) a push button
  9. 9.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  10. 10.🔍 Which is the odd one out? (a) a turning knob (b) a push button (c) a small display (d) a light sensor
  11. 11.📶 Digital or analog: the room temperature? (a) digital (b) analog
  12. 12.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  13. 13.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  15. 15.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  16. 16.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a motor (d) a buzzer
  18. 18.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  19. 19.Which of these is an input? (a) a motor (b) a push button (c) a water pump (d) a servo motor
  20. 20.Which of these is an input? (a) a sound sensor (b) an LED (c) a buzzer (d) a servo motor
  21. 21.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) a servo motor (d) a small display
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  27. 27.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  28. 28.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) an LED (d) a light sensor
  31. 31.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  34. 34.💡 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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a turning knob (d) an LED
  37. 37.Which of these is an input? (a) a water pump (b) a motor (c) a servo motor (d) a turning knob
  38. 38.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  39. 39.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  40. 40.True or false: “a knob turned part way” is a digital signal. (a) False (b) True

Answer key

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

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