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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 390 · 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a keypad (d) a speaker
  3. 3.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  4. 4.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  5. 5.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a water pump (d) an LED
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  8. 8.💡 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) ON (b) OFF
  9. 9.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
  10. 10.Which of these is an output? (a) a push button (b) a keypad (c) a servo motor (d) a temperature sensor
  11. 11.🔌 Is a small display 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 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  16. 16.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  19. 19.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔍 Which is the odd one out? (a) a light sensor (b) a keypad (c) a water pump (d) a push button
  21. 21.💡 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
  22. 22.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  23. 23.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  24. 24.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “the room temperature” 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 8 HIGH
    set pin 8 LOW
    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
  27. 27.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) an LED (d) a light sensor
  28. 28.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.Which of these is an output? (a) a sound sensor (b) an LED (c) a turning knob (d) a temperature sensor
  30. 30.💡 An LED (with its resistor) is on pin 7. 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) ON (b) OFF
  31. 31.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a light sensor (d) a buzzer
  32. 32.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  33. 33.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  34. 34.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  35. 35.🔍 Which is the odd one out? (a) a keypad (b) a motor (c) an LED (d) a buzzer
  36. 36.True or false: “many values in a range” is an analog signal. (a) True (b) False
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an input? (a) a light sensor (b) a servo motor (c) a water pump (d) an LED
  39. 39.💡 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) ON (b) OFF
  40. 40.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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