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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 626 · 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.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 Digital or analog: many values in a range? (a) digital (b) analog
  3. 3.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.💡 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) ON (b) OFF
  5. 5.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  6. 6.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  7. 7.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  8. 8.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  9. 9.Which of these is an output? (a) a turning knob (b) a keypad (c) a sound sensor (d) a water pump
  10. 10.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.Which of these is an input? (a) a speaker (b) a buzzer (c) a light sensor (d) a small display
  14. 14.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  15. 15.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  17. 17.True or false: “many values in a range” is a digital signal. (a) True (b) False
  18. 18.True or false: “the room temperature” is an analog signal. (a) False (b) True
  19. 19.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a light sensor (d) a small display
  20. 20.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  21. 21.Which of these is an input? (a) a keypad (b) an LED (c) a water pump (d) a small display
  22. 22.🔍 Which is the odd one out? (a) a motor (b) a small display (c) a buzzer (d) a sound sensor
  23. 23.📶 Digital or analog: the room temperature? (a) analog (b) digital
  24. 24.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  25. 25.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔍 Which is the odd one out? (a) a water pump (b) a keypad (c) a buzzer (d) an LED
  28. 28.💡 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) ON (b) OFF
  29. 29.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a buzzer (d) a motion sensor
  30. 30.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  31. 31.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  34. 34.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  35. 35.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a turning knob (d) an LED
  36. 36.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  38. 38.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 5 V (d) 0 V
  39. 39.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a temperature sensor (d) a turning knob
  40. 40.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a sound sensor (d) a motion sensor

Answer key

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

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