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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 289 · 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) digital (b) analog
  2. 2.Which of these is an input? (a) a buzzer (b) an LED (c) a motor (d) a sound sensor
  3. 3.📶 Digital or analog: many values in a range? (a) analog (b) digital
  4. 4.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an input? (a) a servo motor (b) a motor (c) a small display (d) a light sensor
  8. 8.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  9. 9.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an output? (a) a push button (b) a motion sensor (c) a temperature sensor (d) a servo motor
  11. 11.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a servo motor (d) a water pump
  12. 12.Which of these is an output? (a) a turning knob (b) a temperature sensor (c) a push button (d) a buzzer
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  14. 14.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a light sensor (d) a buzzer
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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 an analog signal. (a) False (b) True
  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 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  20. 20.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a keypad (d) a water pump
  21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a turning knob (d) a motion sensor
  22. 22.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) a motor (b) a speaker (c) a sound sensor (d) an LED
  24. 24.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a small display
  25. 25.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.📶 Digital or analog: a door: open or shut? (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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  31. 31.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  34. 34.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  35. 35.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  36. 36.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  37. 37.True or false: “many values in a range” is a digital signal. (a) False (b) True
  38. 38.💡 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
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.Which of these is an output? (a) a light sensor (b) a turning knob (c) a sound sensor (d) an LED

Answer key

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

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