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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 470 · 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: “the room temperature” is a digital signal. (a) False (b) True
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.💡 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
    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
  6. 6.💡 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
  7. 7.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  8. 8.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
  10. 10.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a small display (d) a sound sensor
  11. 11.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  12. 12.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    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
  13. 13.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a servo motor (d) a motor
  14. 14.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  15. 15.Which of these is an input? (a) a light sensor (b) a water pump (c) a motor (d) an LED
  16. 16.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  18. 18.True or false: “many values in a range” is a digital signal. (a) True (b) False
  19. 19.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  20. 20.Which of these is an output? (a) a light sensor (b) a water pump (c) a temperature sensor (d) a keypad
  21. 21.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  22. 22.Which of these is an output? (a) a sound sensor (b) a motion sensor (c) a push button (d) a motor
  23. 23.Which of these is an input? (a) a motor (b) a buzzer (c) a small display (d) a push button
  24. 24.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  25. 25.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 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
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.Which of these is an output? (a) a motion sensor (b) a push button (c) a sound sensor (d) a small display
  29. 29.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  30. 30.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  34. 34.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  35. 35.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  36. 36.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  37. 37.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  38. 38.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  39. 39.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a small display (d) a keypad
  40. 40.📶 Digital or analog: how bright a room is? (a) analog (b) digital

Answer key

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

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