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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 231 · 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.

NameDateTime takenScore ___ / 40
  1. 1.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a push button (d) a small display
  3. 3.Which of these is an input? (a) a motion sensor (b) a speaker (c) a motor (d) a buzzer
  4. 4.💡 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  6. 6.📶 Digital or analog: the room temperature? (a) digital (b) analog
  7. 7.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  8. 8.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a turning knob (d) a temperature sensor
  9. 9.Which of these is an output? (a) a temperature sensor (b) a motor (c) a sound sensor (d) a motion sensor
  10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  11. 11.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  12. 12.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  14. 14.Which of these is an output? (a) a light sensor (b) a speaker (c) a temperature sensor (d) a turning knob
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  16. 16.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  17. 17.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a keypad (d) a push button
  18. 18.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a sound sensor (d) a temperature sensor
  19. 19.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) a speaker (d) an LED
  21. 21.💡 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
  22. 22.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  24. 24.Which of these is an input? (a) a sound sensor (b) a buzzer (c) a small display (d) a servo motor
  25. 25.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a water pump (d) a sound sensor
  26. 26.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  27. 27.🔍 Which is the odd one out? (a) a buzzer (b) a temperature sensor (c) a sound sensor (d) a keypad
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  34. 34.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a motion sensor (d) a light sensor
  35. 35.Which of these is an input? (a) a light sensor (b) a water pump (c) a buzzer (d) a motor
  36. 36.💡 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
    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
  37. 37.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a push button (d) a small display
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.💡 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
  40. 40.True or false: “how bright a room is” is a digital signal. (a) False (b) True

Answer key

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

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