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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 587 · 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) True (b) False
  2. 2.Which of these is an output? (a) a motor (b) a light sensor (c) a temperature sensor (d) a sound sensor
  3. 3.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  4. 4.Which of these is an input? (a) a motor (b) a keypad (c) a buzzer (d) a water pump
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  7. 7.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a water pump (d) a turning knob
  8. 8.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  10. 10.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  12. 12.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 Digital or analog: many values in a range? (a) digital (b) analog
  16. 16.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a light sensor (d) a buzzer
  17. 17.Which of these is an input? (a) a water pump (b) a motor (c) a temperature sensor (d) an LED
  18. 18.Which of these is an input? (a) a motion sensor (b) a water pump (c) a small display (d) a buzzer
  19. 19.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  22. 22.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  23. 23.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.True or false: “the room temperature” is an analog signal. (a) False (b) True
  25. 25.True or false: “the room temperature” is a digital signal. (a) True (b) False
  26. 26.Which of these is an input? (a) a water pump (b) an LED (c) a sound sensor (d) a small display
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  28. 28.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔍 Which is the odd one out? (a) a small display (b) a keypad (c) a buzzer (d) a servo motor
  31. 31.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  33. 33.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  34. 34.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  35. 35.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  39. 39.🔍 Which is the odd one out? (a) a motor (b) a turning knob (c) a buzzer (d) a small display
  40. 40.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False

Answer key

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

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