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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 435 · 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.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a motor (d) a buzzer
  2. 2.Which of these is an output? (a) a sound sensor (b) a light sensor (c) an LED (d) a turning knob
  3. 3.💡 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) OFF (b) ON
  4. 4.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  5. 5.Which of these is an input? (a) a speaker (b) a water pump (c) a small display (d) a keypad
  6. 6.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 Digital or analog: the room temperature? (a) analog (b) digital
  8. 8.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  9. 9.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  10. 10.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  11. 11.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  12. 12.💡 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “a tilt switch: on or off” is a digital signal. (a) True (b) False
  15. 15.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  16. 16.True or false: “the room temperature” is a digital signal. (a) True (b) False
  17. 17.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  18. 18.💡 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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an output? (a) a temperature sensor (b) a motor (c) a motion sensor (d) a sound sensor
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a motor (d) a push button
  22. 22.Which of these is an output? (a) a water pump (b) a keypad (c) a light sensor (d) a sound sensor
  23. 23.💡 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 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.Which of these is an output? (a) a light sensor (b) a push button (c) a buzzer (d) a motion sensor
  26. 26.Which of these is an input? (a) a buzzer (b) a water pump (c) a servo motor (d) a sound sensor
  27. 27.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a push button (d) a servo motor
  28. 28.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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) ON (b) OFF
  31. 31.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  32. 32.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  33. 33.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a keypad (d) a motor
  34. 34.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  35. 35.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  36. 36.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  37. 37.Which of these is an input? (a) a motor (b) a servo motor (c) a speaker (d) a push button
  38. 38.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  39. 39.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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