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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 861 · 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.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  2. 2.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  3. 3.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  4. 4.Which of these is an input? (a) a keypad (b) a buzzer (c) a servo motor (d) an LED
  5. 5.True or false: “many values in a range” is an analog signal. (a) False (b) True
  6. 6.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  9. 9.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a buzzer (d) a servo motor
  11. 11.🔍 Which is the odd one out? (a) a push button (b) a servo motor (c) a small display (d) a water pump
  12. 12.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  14. 14.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “the room temperature” is a digital signal. (a) True (b) False
  19. 19.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.True or false: “the room temperature” is an analog signal. (a) False (b) True
  22. 22.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a light sensor (d) a keypad
  24. 24.Which of these is an output? (a) a motion sensor (b) a push button (c) a temperature sensor (d) a servo motor
  25. 25.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a small display (d) a sound sensor
  28. 28.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  31. 31.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  32. 32.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  33. 33.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  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
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
  37. 37.💡 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 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  39. 39.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an input? (a) an LED (b) a small display (c) a servo motor (d) a temperature sensor

Answer key

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

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