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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 999 · 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 of these is an input? (a) a light sensor (b) a buzzer (c) an LED (d) a motor
  2. 2.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  3. 3.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  6. 6.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 9 V (d) 5 V
  8. 8.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  10. 10.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  11. 11.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  16. 16.Which of these is an input? (a) a servo motor (b) an LED (c) a water pump (d) a temperature sensor
  17. 17.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  18. 18.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  19. 19.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  20. 20.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a speaker (d) a keypad
  23. 23.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  24. 24.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a keypad (d) a sound sensor
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a turning knob (d) a buzzer
  29. 29.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  30. 30.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.True or false: “the room temperature” is an analog signal. (a) True (b) False
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  36. 36.💡 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
  37. 37.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  38. 38.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  39. 39.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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