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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 780 · 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.📶 Digital or analog: the room temperature? (a) analog (b) digital
  2. 2.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  3. 3.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a water pump (d) a buzzer
  4. 4.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  5. 5.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  6. 6.💡 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
  7. 7.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a keypad (d) a push button
  8. 8.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 230 V (c) 50 V (d) 0 V
  9. 9.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an output? (a) a light sensor (b) a buzzer (c) a sound sensor (d) a turning knob
  11. 11.💡 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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.True or false: “the room temperature” is a digital signal. (a) True (b) False
  13. 13.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a speaker (d) a motion sensor
  15. 15.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  18. 18.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  21. 21.Which of these is an output? (a) a temperature sensor (b) an LED (c) a turning knob (d) a motion sensor
  22. 22.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.Which of these is an input? (a) an LED (b) a turning knob (c) a buzzer (d) a small display
  24. 24.Which of these is an input? (a) a water pump (b) a keypad (c) a buzzer (d) an LED
  25. 25.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  26. 26.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  28. 28.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  29. 29.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  32. 32.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 5 V (d) 1.5 V
  33. 33.Which of these is an input? (a) an LED (b) a motion sensor (c) a water pump (d) a small display
  34. 34.Which of these is an input? (a) an LED (b) a temperature sensor (c) a servo motor (d) a small display
  35. 35.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  36. 36.💡 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) OFF (b) ON
  37. 37.Which of these is an input? (a) an LED (b) a small display (c) a buzzer (d) a push button
  38. 38.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a keypad (d) a motion sensor
  39. 39.🔍 Which is the odd one out? (a) a temperature sensor (b) a motor (c) a water pump (d) an LED
  40. 40.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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