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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 569 · 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.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  3. 3.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  8. 8.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  9. 9.Which of these is an input? (a) a motor (b) a buzzer (c) a small display (d) a sound sensor
  10. 10.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  12. 12.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  13. 13.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  14. 14.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  15. 15.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔍 Which is the odd one out? (a) a small display (b) a push button (c) a turning knob (d) a sound sensor
  18. 18.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a speaker
  19. 19.Which of these is an output? (a) a motion sensor (b) a motor (c) a temperature sensor (d) a push button
  20. 20.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.True or false: “the room temperature” is a digital signal. (a) True (b) False
  24. 24.Which of these is an input? (a) a speaker (b) a keypad (c) a buzzer (d) a motor
  25. 25.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.Which of these is an output? (a) a push button (b) a motion sensor (c) a water pump (d) a sound sensor
  29. 29.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  30. 30.🔌 Is a light sensor 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  33. 33.Which of these is an input? (a) a water pump (b) a motor (c) a servo motor (d) a motion sensor
  34. 34.💡 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
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.Which of these is an input? (a) an LED (b) a light sensor (c) a motor (d) a servo motor
  36. 36.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 5 V (d) 0 V
  38. 38.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a turning knob (d) a keypad
  40. 40.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a keypad (d) a speaker

Answer key

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

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