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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 187 · 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.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  2. 2.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an input? (a) a small display (b) a servo motor (c) a turning knob (d) an LED
  4. 4.True or false: “the room temperature” is a digital signal. (a) True (b) False
  5. 5.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  6. 6.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  7. 7.True or false: “many values in a range” is a digital signal. (a) False (b) True
  8. 8.Which of these is an output? (a) a motion sensor (b) a keypad (c) a temperature sensor (d) a small display
  9. 9.Which of these is an output? (a) a light sensor (b) a turning knob (c) a motion sensor (d) a speaker
  10. 10.💡 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
  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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a servo motor (d) a push button
  13. 13.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  14. 14.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  15. 15.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  16. 16.Which of these is an output? (a) a motor (b) a light sensor (c) a turning knob (d) a keypad
  17. 17.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  18. 18.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  19. 19.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  20. 20.True or false: “the room temperature” is an analog signal. (a) True (b) False
  21. 21.Which of these is an input? (a) a small display (b) a motion sensor (c) a buzzer (d) a motor
  22. 22.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  23. 23.💡 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
  24. 24.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  27. 27.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  28. 28.Which of these is an input? (a) an LED (b) a keypad (c) a motor (d) a buzzer
  29. 29.Which of these is an input? (a) a buzzer (b) a water pump (c) a motor (d) a light sensor
  30. 30.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  31. 31.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.Which of these is an output? (a) a keypad (b) a servo motor (c) a light sensor (d) a temperature sensor
  33. 33.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 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) ON (b) OFF
  35. 35.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a water pump (d) a speaker
  37. 37.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an input? (a) a small display (b) a motor (c) a water pump (d) a sound sensor
  39. 39.🔌 Is a speaker 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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