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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 465 · 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) False (b) True
  2. 2.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  3. 3.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a water pump (d) a motion sensor
  4. 4.True or false: “many values in a range” is an analog signal. (a) True (b) False
  5. 5.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  6. 6.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  8. 8.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  10. 10.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a turning knob (d) a push button
  11. 11.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  12. 12.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  13. 13.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “the room temperature” is an analog signal. (a) False (b) True
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) an LED (d) a speaker
  17. 17.Which of these is an input? (a) a small display (b) a water pump (c) an LED (d) a temperature sensor
  18. 18.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  19. 19.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  20. 20.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 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 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  24. 24.Which of these is an input? (a) a small display (b) a servo motor (c) a light sensor (d) a water pump
  25. 25.Which of these is an input? (a) a small display (b) a water pump (c) an LED (d) a keypad
  26. 26.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a light sensor (d) a motor
  27. 27.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  28. 28.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  29. 29.Which of these is an input? (a) an LED (b) a push button (c) a servo motor (d) a motor
  30. 30.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  31. 31.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a turning knob (d) an LED
  32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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) ON (b) OFF
  35. 35.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.Which of these is an output? (a) a light sensor (b) a small display (c) a push button (d) a temperature sensor

Answer key

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

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