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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 621 · 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 is the odd one out? (a) an LED (b) a temperature sensor (c) a light sensor (d) a sound sensor
  2. 2.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  3. 3.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.📶 Digital or analog: a door: open or shut? (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 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  9. 9.Which of these is an input? (a) an LED (b) a small display (c) a motor (d) a keypad
  10. 10.💡 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
  11. 11.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) a buzzer (d) a servo motor
  12. 12.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  13. 13.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  14. 14.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  15. 15.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  16. 16.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a motor (d) a turning knob
  17. 17.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  18. 18.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  19. 19.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  20. 20.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  22. 22.📶 Digital or analog: the room temperature? (a) digital (b) analog
  23. 23.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  24. 24.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a push button (d) a servo motor
  28. 28.🔍 Which is the odd one out? (a) a small display (b) a light sensor (c) a motor (d) a buzzer
  29. 29.Which of these is an input? (a) a small display (b) a servo motor (c) a temperature sensor (d) a motor
  30. 30.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  31. 31.📶 Digital or analog: many values in a range? (a) digital (b) analog
  32. 32.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a servo motor (d) a speaker
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  37. 37.True or false: “the room temperature” is an analog signal. (a) False (b) True
  38. 38.Which of these is an output? (a) a motion sensor (b) an LED (c) a keypad (d) a temperature sensor
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔍 Which is the odd one out? (a) a buzzer (b) a water pump (c) a turning knob (d) an LED

Answer key

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

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