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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 611 · 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 button: pressed or not” is a digital signal. (a) True (b) False
  2. 2.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  3. 3.Which of these is an input? (a) a motor (b) a speaker (c) a buzzer (d) a temperature sensor
  4. 4.True or false: “the room temperature” is an analog signal. (a) False (b) True
  5. 5.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  8. 8.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  11. 11.Which of these is an output? (a) an LED (b) a turning knob (c) a push button (d) a light sensor
  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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.🔍 Which is the odd one out? (a) a speaker (b) an LED (c) a small display (d) a sound sensor
  16. 16.💡 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
    set pin 8 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  19. 19.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  20. 20.Which of these is an output? (a) a motion sensor (b) a small display (c) a temperature sensor (d) a light sensor
  21. 21.💡 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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a push button (d) a sound sensor
  23. 23.Which of these is an output? (a) a keypad (b) a sound sensor (c) a temperature sensor (d) a water pump
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) an LED (d) a buzzer
  27. 27.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  28. 28.True or false: “the room temperature” is a digital signal. (a) False (b) True
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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
    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 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.💡 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) ON (b) OFF
  33. 33.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.💡 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) ON (b) OFF
  35. 35.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  36. 36.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  37. 37.💡 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
  38. 38.Which of these is an output? (a) a keypad (b) a temperature sensor (c) a light sensor (d) a servo motor
  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 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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