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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 167 · 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.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  2. 2.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  3. 3.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.Which of these is an input? (a) a servo motor (b) a keypad (c) an LED (d) a motor
  6. 6.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 Digital or analog: the room temperature? (a) digital (b) analog
  8. 8.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.Which of these is an output? (a) a keypad (b) a push button (c) a temperature sensor (d) a speaker
  11. 11.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.Which of these is an input? (a) a temperature sensor (b) a buzzer (c) a motor (d) an LED
  13. 13.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an output? (a) a small display (b) a light sensor (c) a motion sensor (d) a temperature sensor
  15. 15.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  19. 19.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: many values in a range? (a) analog (b) digital
  23. 23.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  24. 24.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  25. 25.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  26. 26.Which of these is an output? (a) a water pump (b) a turning knob (c) a light sensor (d) a motion sensor
  27. 27.🔍 Which is the odd one out? (a) a temperature sensor (b) a keypad (c) a light sensor (d) a speaker
  28. 28.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  30. 30.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  31. 31.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  32. 32.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  33. 33.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  34. 34.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  35. 35.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a water pump (d) a light sensor
  36. 36.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  37. 37.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.Which of these is an output? (a) a buzzer (b) a turning knob (c) a light sensor (d) a motion sensor
  40. 40.💡 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

Answer key

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

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