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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 486 · 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 door: open or shut” is an analog signal. (a) False (b) True
  2. 2.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.Which of these is an input? (a) a speaker (b) a servo motor (c) an LED (d) a light sensor
  4. 4.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  5. 5.💡 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 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  8. 8.💡 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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  11. 11.Which of these is an input? (a) a servo motor (b) a motor (c) a motion sensor (d) a water pump
  12. 12.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  16. 16.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) an LED (d) a temperature sensor
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  19. 19.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  20. 20.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  21. 21.Which of these is an output? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a water pump
  22. 22.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  23. 23.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a turning knob (d) a small display
  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 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.True or false: “many values in a range” is a digital signal. (a) False (b) True
  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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  28. 28.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a water pump (d) a push button
  30. 30.Which of these is an output? (a) a motion sensor (b) a motor (c) a temperature sensor (d) a push button
  31. 31.💡 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
  32. 32.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  33. 33.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  34. 34.💡 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
  35. 35.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a turning knob (d) a speaker
  37. 37.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a buzzer
  38. 38.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  39. 39.Which of these is an input? (a) an LED (b) a buzzer (c) a servo motor (d) a push button
  40. 40.💡 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

Answer key

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

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