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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 76 · 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.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  2. 2.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  3. 3.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a motion sensor (d) an LED
  6. 6.🔌 Is a speaker 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 5 V (d) 9 V
  10. 10.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a small display (d) a keypad
  11. 11.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a sound sensor (d) a push button
  12. 12.Which of these is an input? (a) a buzzer (b) a turning knob (c) a motor (d) a small display
  13. 13.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  16. 16.Which of these is an output? (a) a light sensor (b) a motion sensor (c) an LED (d) a turning knob
  17. 17.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  20. 20.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  21. 21.True or false: “the room temperature” is an analog signal. (a) False (b) True
  22. 22.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a light sensor (d) a servo motor
  23. 23.🔍 Which is the odd one out? (a) a speaker (b) a light sensor (c) a sound sensor (d) a keypad
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an input? (a) a light sensor (b) a water pump (c) a servo motor (d) an LED
  26. 26.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a push button (d) an LED
  29. 29.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a speaker (d) a servo motor
  30. 30.Which of these is an output? (a) a push button (b) a small display (c) a motion sensor (d) a sound sensor
  31. 31.🔍 Which is the odd one out? (a) a keypad (b) a push button (c) a turning knob (d) a buzzer
  32. 32.💡 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 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  34. 34.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  38. 38.📶 Digital or analog: the room temperature? (a) analog (b) digital
  39. 39.📶 Digital or analog: many values in a range? (a) analog (b) digital
  40. 40.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False

Answer key

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

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