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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 631 · 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.Which of these is an output? (a) a small display (b) a light sensor (c) a sound sensor (d) a keypad
  3. 3.Which of these is an input? (a) an LED (b) a motion sensor (c) a speaker (d) a small display
  4. 4.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 0 V (d) 230 V
  5. 5.💡 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
  6. 6.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  7. 7.📶 Digital or analog: the room temperature? (a) digital (b) analog
  8. 8.💡 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
  9. 9.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  11. 11.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  14. 14.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  15. 15.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  16. 16.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  17. 17.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a turning knob (d) a light sensor
  18. 18.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  19. 19.💡 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
  20. 20.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.💡 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
  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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  25. 25.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  26. 26.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  27. 27.🔍 Which is the odd one out? (a) an LED (b) a servo motor (c) a water pump (d) a light sensor
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a motion sensor (d) a push button
  30. 30.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 An LED (with its resistor) is on pin 8. 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
  32. 32.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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
    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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a buzzer (d) a water pump
  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 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔍 Which is the odd one out? (a) a temperature sensor (b) a light sensor (c) a turning knob (d) a water pump

Answer key

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

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