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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 406 · 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.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
  2. 2.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  3. 3.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  4. 4.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a keypad (d) an LED
  5. 5.Which of these is an output? (a) a turning knob (b) a sound sensor (c) an LED (d) a motion sensor
  6. 6.Which of these is an input? (a) a speaker (b) a keypad (c) a motor (d) a small display
  7. 7.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  8. 8.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a motor (d) a buzzer
  10. 10.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.💡 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 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  14. 14.True or false: “the room temperature” is a digital signal. (a) False (b) True
  15. 15.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  16. 16.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  17. 17.Which of these is an input? (a) a speaker (b) a motor (c) an LED (d) a push button
  18. 18.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  19. 19.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  22. 22.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  24. 24.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a motor (d) a light sensor
  25. 25.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a push button (d) a water pump
  26. 26.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  27. 27.📶 Digital or analog: the room temperature? (a) digital (b) analog
  28. 28.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.Which of these is an input? (a) an LED (b) a light sensor (c) a buzzer (d) a motor
  30. 30.True or false: “many values in a range” is a digital signal. (a) False (b) True
  31. 31.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  32. 32.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  33. 33.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a turning knob (d) a push button
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    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.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a small display (d) a water pump
  37. 37.🔍 Which is the odd one out? (a) a servo motor (b) a water pump (c) a motion sensor (d) an LED
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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