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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 345 · 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) a speaker (b) a light sensor (c) a buzzer (d) a water pump
  2. 2.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  3. 3.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output
  4. 4.Which of these is an input? (a) a servo motor (b) a push button (c) a water pump (d) a motor
  5. 5.Which of these is an input? (a) a sound sensor (b) a motor (c) a small display (d) a servo motor
  6. 6.💡 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
    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
  7. 7.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.Which of these is an input? (a) a motion sensor (b) a motor (c) a servo motor (d) a water pump
  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 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  11. 11.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  12. 12.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  13. 13.Which of these is an input? (a) a keypad (b) a servo motor (c) an LED (d) a buzzer
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.Which of these is an output? (a) a turning knob (b) a push button (c) a sound sensor (d) a water pump
  17. 17.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.True or false: “many values in a range” is a digital signal. (a) True (b) False
  19. 19.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  20. 20.Which of these is an output? (a) a push button (b) a sound sensor (c) a motor (d) a light sensor
  21. 21.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  22. 22.💡 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
  23. 23.🔍 Which is the odd one out? (a) a motion sensor (b) a temperature sensor (c) an LED (d) a sound sensor
  24. 24.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.💡 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) ON (b) OFF
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an output? (a) a keypad (b) a sound sensor (c) a servo motor (d) a motion sensor
  31. 31.💡 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
  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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  34. 34.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  36. 36.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  37. 37.💡 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 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  39. 39.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a speaker (d) a light sensor
  40. 40.Which of these is an output? (a) a motion sensor (b) a small display (c) a turning knob (d) a light sensor

Answer key

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

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