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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 901 · 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  3. 3.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  4. 4.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  5. 5.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  6. 6.Which of these is an output? (a) a light sensor (b) a push button (c) a keypad (d) an LED
  7. 7.📶 Digital or analog: the room temperature? (a) analog (b) digital
  8. 8.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 1.5 V (d) 0 V
  9. 9.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  10. 10.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a turning knob (d) a push button
  11. 11.Which of these is an input? (a) a motor (b) a light sensor (c) a servo motor (d) a water pump
  12. 12.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a push button (d) a temperature sensor
  13. 13.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.Which of these is an output? (a) a turning knob (b) a push button (c) a keypad (d) a motor
  17. 17.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  19. 19.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  20. 20.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  21. 21.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔍 Which is the odd one out? (a) a small display (b) a sound sensor (c) a buzzer (d) a motor
  24. 24.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  26. 26.💡 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 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a keypad (d) a water pump
  30. 30.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  31. 31.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  34. 34.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a servo motor (d) a motor
  35. 35.💡 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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  37. 37.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  38. 38.💡 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) ON (b) OFF
  39. 39.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.True or false: “many values in a range” is a digital signal. (a) True (b) False

Answer key

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

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