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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 778 · 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: a tilt switch: on or off? (a) analog (b) digital
  2. 2.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  3. 3.📶 Digital or analog: the room temperature? (a) analog (b) digital
  4. 4.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  5. 5.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  6. 6.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  7. 7.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
  8. 8.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a push button (d) a water pump
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a water pump (d) a sound sensor
  10. 10.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  11. 11.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a light sensor (d) a sound sensor
  12. 12.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  14. 14.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a small display (d) a keypad
  15. 15.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  17. 17.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an input? (a) a speaker (b) a water pump (c) a sound sensor (d) a motor
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.Which of these is an output? (a) a motor (b) a push button (c) a keypad (d) a light sensor
  21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.🔍 Which is the odd one out? (a) a turning knob (b) a servo motor (c) a motion sensor (d) a keypad
  23. 23.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  24. 24.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  25. 25.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  26. 26.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  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 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.True or false: “the room temperature” is an analog signal. (a) False (b) True
  31. 31.💡 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 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  33. 33.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  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 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.Which of these is an input? (a) a speaker (b) a motor (c) a temperature sensor (d) a small display
  37. 37.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  38. 38.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.Which of these is an input? (a) a water pump (b) a motor (c) a light sensor (d) a small display

Answer key

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

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