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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 615 · 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: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  2. 2.Which of these is an output? (a) a keypad (b) a speaker (c) a sound sensor (d) a light sensor
  3. 3.True or false: “many values in a range” is a digital 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 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.💡 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
  9. 9.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  10. 10.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a servo motor (d) an LED
  11. 11.💡 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 7 LOW
    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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a buzzer (d) a turning knob
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  15. 15.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  19. 19.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  22. 22.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  23. 23.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  24. 24.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.🔌 Is a keypad 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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  29. 29.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a keypad (d) a speaker
  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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  33. 33.📶 Digital or analog: the room temperature? (a) analog (b) digital
  34. 34.🔍 Which is the odd one out? (a) a temperature sensor (b) a sound sensor (c) a small display (d) a turning knob
  35. 35.Which of these is an input? (a) a speaker (b) an LED (c) a light sensor (d) a buzzer
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  38. 38.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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