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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 964 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 50 V (d) 0 V
  2. 2.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a push button (d) a buzzer
  3. 3.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  4. 4.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a push button (d) a buzzer
  6. 6.🔍 Which is the odd one out? (a) a light sensor (b) a motor (c) a water pump (d) a speaker
  7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  8. 8.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
  9. 9.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  10. 10.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an input? (a) a temperature sensor (b) a speaker (c) a small display (d) an LED
  12. 12.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  13. 13.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  14. 14.Which of these is an output? (a) a motion sensor (b) a buzzer (c) a light sensor (d) a push button
  15. 15.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  18. 18.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  20. 20.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) an LED (d) a turning knob
  22. 22.Which of these is an input? (a) a sound sensor (b) a small display (c) a servo motor (d) a buzzer
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.True or false: “the room temperature” is an analog signal. (a) True (b) False
  29. 29.True or false: “many values in a range” is a digital signal. (a) False (b) True
  30. 30.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) a small display (d) a buzzer
  31. 31.💡 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
  32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a push button (d) a turning knob
  34. 34.Which of these is an output? (a) a keypad (b) a turning knob (c) a motor (d) a sound sensor
  35. 35.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  36. 36.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  37. 37.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  38. 38.Which of these is an input? (a) a push button (b) a speaker (c) a motor (d) a water pump
  39. 39.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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