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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 126 · 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 a digital signal. (a) False (b) True
  2. 2.Which of these is an input? (a) a water pump (b) a servo motor (c) a motion sensor (d) an LED
  3. 3.💡 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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  5. 5.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a temperature sensor (d) a light sensor
  6. 6.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  7. 7.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  9. 9.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  10. 10.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.Which of these is an input? (a) a speaker (b) a buzzer (c) a small display (d) a light sensor
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  18. 18.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a buzzer (d) a water pump
  19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a motor (d) an LED
  21. 21.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
  23. 23.💡 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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an input? (a) a servo motor (b) a temperature sensor (c) a small display (d) a speaker
  26. 26.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  27. 27.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  28. 28.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  32. 32.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  33. 33.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  34. 34.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a buzzer (d) a light sensor
  35. 35.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a sound sensor (d) a buzzer
  37. 37.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.Which of these is an input? (a) a motor (b) an LED (c) a speaker (d) a turning knob
  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.🔍 Which is the odd one out? (a) a servo motor (b) a light sensor (c) a push button (d) a motion sensor

Answer key

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

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