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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 191 · 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.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  2. 2.Which of these is an input? (a) a speaker (b) a motor (c) a water pump (d) a light sensor
  3. 3.💡 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
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔍 Which is the odd one out? (a) a light sensor (b) a sound sensor (c) a small display (d) a turning knob
  5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  6. 6.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  7. 7.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  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 7 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  10. 10.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) two (d) one
  11. 11.Which of these is an output? (a) a keypad (b) a buzzer (c) a motion sensor (d) a light sensor
  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 7 HIGH
    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
  13. 13.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  19. 19.💡 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 8 LOW
    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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  22. 22.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  23. 23.💡 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
  24. 24.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  25. 25.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  26. 26.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a speaker (d) a buzzer
  27. 27.True or false: “the room temperature” is an analog signal. (a) False (b) True
  28. 28.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a sound sensor (d) a buzzer
  29. 29.💡 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
  30. 30.Which of these is an output? (a) an LED (b) a temperature sensor (c) a push button (d) a light sensor
  31. 31.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) a servo motor (d) a motor
  33. 33.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a temperature sensor (d) a keypad
  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.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  36. 36.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  37. 37.🔍 Which is the odd one out? (a) an LED (b) a motor (c) a keypad (d) a water pump
  38. 38.Which of these is an input? (a) a servo motor (b) a buzzer (c) a water pump (d) a push button
  39. 39.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) an input (d) a resistor
  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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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