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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 199 · 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.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  3. 3.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  4. 4.💡 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) ON (b) OFF
  5. 5.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  6. 6.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a sound sensor (d) a buzzer
  9. 9.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a small display (d) a water pump
  10. 10.💡 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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) an output (d) a resistor
  12. 12.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  13. 13.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a temperature sensor (d) a push button
  14. 14.True or false: “the room temperature” is a digital signal. (a) True (b) False
  15. 15.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  17. 17.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  18. 18.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  19. 19.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  20. 20.Which of these is an input? (a) a servo motor (b) an LED (c) a small display (d) a turning knob
  21. 21.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  22. 22.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a temperature sensor (d) a sound sensor
  23. 23.💡 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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an input? (a) a small display (b) a light sensor (c) a buzzer (d) an LED
  27. 27.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an output? (a) a motion sensor (b) a keypad (c) an LED (d) a temperature sensor
  29. 29.Which of these is an output? (a) a light sensor (b) a small display (c) a turning knob (d) a motion sensor
  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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an output? (a) a water pump (b) a keypad (c) a motion sensor (d) a turning knob
  32. 32.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  38. 38.Which of these is an output? (a) a buzzer (b) a turning knob (c) a temperature sensor (d) a motion sensor
  39. 39.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  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) OFF (b) ON

Answer key

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

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