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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 401 · 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 a push button an input or an output for a microcontroller? (a) output (b) input
  2. 2.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) a buzzer (d) a water pump
  3. 3.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  4. 4.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.Which of these is an input? (a) a light sensor (b) a servo motor (c) a motor (d) an LED
  6. 6.True or false: “many values in a range” is an analog signal. (a) False (b) True
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a sound sensor (d) an LED
  10. 10.Which of these is an output? (a) a keypad (b) a motion sensor (c) a turning knob (d) an LED
  11. 11.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a keypad (d) a speaker
  15. 15.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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 LOW
    set pin 8 LOW
    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 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: the room temperature? (a) digital (b) analog
  19. 19.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  20. 20.🔍 Which is the odd one out? (a) a turning knob (b) a keypad (c) a water pump (d) a temperature sensor
  21. 21.💡 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 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.💡 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
  23. 23.💡 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
  24. 24.💡 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) ON (b) OFF
  25. 25.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  26. 26.🔍 Which is the odd one out? (a) a buzzer (b) a light sensor (c) a small display (d) a water pump
  27. 27.📶 Digital or analog: many values in a range? (a) analog (b) digital
  28. 28.🔍 Which is the odd one out? (a) a light sensor (b) a small display (c) a temperature sensor (d) a push button
  29. 29.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a push button (d) a servo motor
  30. 30.Which of these is an input? (a) a small display (b) a temperature sensor (c) a buzzer (d) a water pump
  31. 31.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a water pump (d) a temperature sensor
  33. 33.True or false: “many values in a range” is a digital signal. (a) True (b) False
  34. 34.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  35. 35.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  36. 36.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) a servo motor (d) a turning knob
  37. 37.Which of these is an output? (a) a servo motor (b) a turning knob (c) a light sensor (d) a temperature sensor
  38. 38.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a speaker (d) a push button
  39. 39.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  40. 40.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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