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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 523 · 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 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.True or false: “the room temperature” is an analog signal. (a) False (b) True
  3. 3.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  5. 5.Which of these is an input? (a) a servo motor (b) a small display (c) a water pump (d) a keypad
  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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a buzzer (d) a water pump
  10. 10.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  12. 12.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  13. 13.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  14. 14.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  15. 15.Which of these is an input? (a) a buzzer (b) a motor (c) a small display (d) a push button
  16. 16.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.Which of these is an input? (a) a water pump (b) a light sensor (c) a servo motor (d) a speaker
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  27. 27.Which of these is an input? (a) a motor (b) a turning knob (c) a water pump (d) a buzzer
  28. 28.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a push button (d) an LED
  29. 29.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  30. 30.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  31. 31.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  32. 32.💡 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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an output? (a) a keypad (b) a sound sensor (c) a turning knob (d) a motor
  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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a temperature sensor (d) a motor
  36. 36.💡 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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: many values in a range? (a) digital (b) analog
  38. 38.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  39. 39.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  40. 40.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten

Answer key

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

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