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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 558 · 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.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a speaker (d) a motor
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  3. 3.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 Digital or analog: many values in a range? (a) analog (b) digital
  5. 5.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) a battery (d) an output
  6. 6.🔍 Which is the odd one out? (a) a motor (b) a push button (c) a temperature sensor (d) a keypad
  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 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 8 HIGH
    set pin 8 HIGH
    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 speaker an input or an output for a microcontroller? (a) output (b) input
  10. 10.🔍 Which is the odd one out? (a) a water pump (b) a turning knob (c) a servo motor (d) a motor
  11. 11.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  12. 12.💡 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
  13. 13.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) a servo motor (d) a push button
  14. 14.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a push button (d) a turning knob
  15. 15.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  16. 16.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  17. 17.Which of these is an input? (a) a water pump (b) a buzzer (c) a small display (d) a push button
  18. 18.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  19. 19.True or false: “many values in a range” is an analog signal. (a) True (b) False
  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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  22. 22.Which of these is an input? (a) a motor (b) a motion sensor (c) a buzzer (d) an LED
  23. 23.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  24. 24.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  25. 25.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  26. 26.Which of these is an output? (a) a small display (b) a turning knob (c) a temperature sensor (d) a light sensor
  27. 27.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  28. 28.Which of these is an input? (a) a buzzer (b) a turning knob (c) a small display (d) an LED
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a keypad (d) a turning knob
  31. 31.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  33. 33.Which of these is an input? (a) a speaker (b) a light sensor (c) a buzzer (d) an LED
  34. 34.💡 An LED (with its resistor) is on pin 7. 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
  35. 35.💡 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 LOW
    set pin 8 HIGH
    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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.True or false: “the room temperature” is an analog signal. (a) False (b) True
  38. 38.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a small display
  39. 39.💡 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) ON (b) OFF
  40. 40.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a turning knob (d) a small display

Answer key

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

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