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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 949 · 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: “how bright a room is” is a digital signal. (a) False (b) True
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a motor (d) a keypad
  4. 4.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  5. 5.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  8. 8.Which of these is an output? (a) a speaker (b) a push button (c) a keypad (d) a light sensor
  9. 9.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  10. 10.💡 An LED (with its resistor) is on pin 8. 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
  11. 11.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  12. 12.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a motion sensor (d) an LED
  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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a speaker (d) a sound sensor
  15. 15.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a motor (d) a turning knob
  16. 16.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a push button (d) a motor
  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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  19. 19.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  20. 20.Which of these is an input? (a) a motion sensor (b) an LED (c) a buzzer (d) a speaker
  21. 21.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  22. 22.📶 Digital or analog: the room temperature? (a) analog (b) digital
  23. 23.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  24. 24.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  25. 25.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  26. 26.💡 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) ON (b) OFF
  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 LOW
    set pin 8 HIGH
    set pin 8 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 push button (b) a keypad (c) a small display (d) a motion sensor
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “many values in a range” is an analog signal. (a) False (b) True
  31. 31.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  37. 37.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  38. 38.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  39. 39.💡 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) ON (b) OFF
  40. 40.True or false: “a knob turned part way” is an analog signal. (a) False (b) True

Answer key

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

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