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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 508 · 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.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  2. 2.True or false: “many values in a range” is an analog signal. (a) True (b) False
  3. 3.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
  5. 5.🔍 Which is the odd one out? (a) a servo motor (b) a motion sensor (c) a speaker (d) a small display
  6. 6.📶 Digital or analog: many values in a range? (a) analog (b) digital
  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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  9. 9.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.💡 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
  11. 11.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  12. 12.Which of these is an input? (a) a turning knob (b) a motor (c) a servo 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  15. 15.📶 Digital or analog: the room temperature? (a) digital (b) analog
  16. 16.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an input? (a) a buzzer (b) a water pump (c) a push button (d) a small display
  19. 19.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a turning knob (d) a push button
  20. 20.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  24. 24.Which of these is an input? (a) a temperature sensor (b) a speaker (c) an LED (d) a small display
  25. 25.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a water pump (d) a motor
  26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) a buzzer (c) a light sensor (d) a push button
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  29. 29.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  31. 31.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  32. 32.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  33. 33.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) a light sensor (d) a sound sensor
  35. 35.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  37. 37.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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) ON (b) OFF
  39. 39.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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