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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 475 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  2. 2.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  3. 3.Which of these is an input? (a) a buzzer (b) a water pump (c) a motion sensor (d) a motor
  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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V
  6. 6.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) a water pump (d) a turning knob
  7. 7.True or false: “the room temperature” is an analog signal. (a) True (b) False
  8. 8.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  9. 9.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  10. 10.Which of these is an input? (a) a water pump (b) a servo motor (c) a small display (d) a turning knob
  11. 11.💡 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
  12. 12.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a water pump (d) a keypad
  13. 13.Which of these is an input? (a) a buzzer (b) a motor (c) a temperature sensor (d) an LED
  14. 14.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  15. 15.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a turning knob (d) a small display
  16. 16.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a sound sensor (d) a motor
  18. 18.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  19. 19.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  21. 21.Which of these is an output? (a) a push button (b) a turning knob (c) a motion sensor (d) a servo motor
  22. 22.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a servo motor (d) a motion sensor
  23. 23.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  27. 27.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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) OFF (b) ON
  30. 30.💡 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
  31. 31.💡 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
  32. 32.Which of these is an input? (a) a water pump (b) a servo motor (c) a buzzer (d) a light sensor
  33. 33.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  34. 34.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  36. 36.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  37. 37.🔍 Which is the odd one out? (a) a motor (b) a keypad (c) a small display (d) a water pump
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  39. 39.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  40. 40.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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