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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 253 · 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) an LED (b) a small display (c) a light sensor (d) a water pump
  2. 2.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  3. 3.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  4. 4.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a temperature sensor (d) a motor
  5. 5.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  6. 6.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  7. 7.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 Digital or analog: many values in a range? (a) analog (b) digital
  9. 9.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) an LED
  10. 10.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a push button (d) an LED
  11. 11.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  14. 14.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  15. 15.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  16. 16.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.💡 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 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 turning knob (b) a small display (c) a push button (d) a light sensor
  22. 22.💡 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) ON (b) OFF
  23. 23.Which of these is an input? (a) a motor (b) a small display (c) a light sensor (d) an LED
  24. 24.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) a resistor (d) an output
  25. 25.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a keypad (d) a water pump
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  28. 28.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a sound sensor (d) a light sensor
  29. 29.Which of these is an input? (a) a buzzer (b) a motor (c) a motion sensor (d) a water pump
  30. 30.📶 Digital or analog: the room temperature? (a) digital (b) analog
  31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  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) OFF (b) ON
  33. 33.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  36. 36.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.Which of these is an input? (a) a push button (b) a motor (c) a water pump (d) a small display
  38. 38.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a turning knob (d) a buzzer
  39. 39.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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