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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 919 · 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.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  3. 3.💡 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) OFF (b) ON
  4. 4.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  6. 6.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
  7. 7.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a buzzer (d) a temperature sensor
  9. 9.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  10. 10.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) a motion sensor (d) a speaker
  12. 12.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  13. 13.True or false: “the room temperature” is a digital signal. (a) False (b) True
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  15. 15.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a water pump (d) a small display
  18. 18.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  19. 19.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  22. 22.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  23. 23.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  24. 24.💡 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) ON (b) OFF
  25. 25.Which of these is an input? (a) a buzzer (b) a water pump (c) a sound sensor (d) a speaker
  26. 26.Which of these is an output? (a) a motor (b) a motion sensor (c) a sound sensor (d) a light sensor
  27. 27.📶 Digital or analog: the room temperature? (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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an input? (a) an LED (b) a keypad (c) a speaker (d) a motor
  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 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.True or false: “the room temperature” is an analog signal. (a) False (b) True
  33. 33.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  34. 34.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  35. 35.True or false: “many values in a range” is a digital signal. (a) True (b) False
  36. 36.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  40. 40.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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