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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 329 · 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.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a servo motor (d) a turning knob
  2. 2.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  3. 3.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 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) OFF (b) ON
  5. 5.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  7. 7.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  10. 10.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  11. 11.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  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 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  14. 14.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  16. 16.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  17. 17.📶 Digital or analog: the room temperature? (a) analog (b) digital
  18. 18.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a servo motor
  19. 19.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  20. 20.💡 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
  21. 21.Which of these is an output? (a) a light sensor (b) a push button (c) a temperature sensor (d) a speaker
  22. 22.Which of these is an input? (a) a motor (b) a sound sensor (c) a servo motor (d) a water pump
  23. 23.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  24. 24.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  25. 25.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a motor
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a temperature sensor (d) a keypad
  28. 28.💡 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
    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
  29. 29.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a turning knob (d) a sound sensor
  30. 30.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  31. 31.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  35. 35.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) a motor (d) an LED
  36. 36.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔍 Which is the odd one out? (a) a motion sensor (b) a servo motor (c) a motor (d) a speaker
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a keypad (b) a water pump (c) a buzzer (d) a motor
  40. 40.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog

Answer key

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

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