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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 318 · 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) a battery (d) an input
  3. 3.Which of these is an input? (a) a speaker (b) a servo motor (c) a small display (d) a push button
  4. 4.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  5. 5.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a servo motor (d) a push button
  7. 7.💡 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
  8. 8.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  9. 9.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  12. 12.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  13. 13.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  15. 15.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  16. 16.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
  17. 17.True or false: “many values in a range” is a digital signal. (a) True (b) False
  18. 18.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  19. 19.Which of these is an input? (a) a water pump (b) an LED (c) a speaker (d) a turning knob
  20. 20.🔍 Which is the odd one out? (a) a keypad (b) an LED (c) a servo motor (d) a buzzer
  21. 21.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.📶 Digital or analog: many values in a range? (a) digital (b) analog
  23. 23.True or false: “the room temperature” is an analog signal. (a) False (b) True
  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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an output? (a) a keypad (b) a light sensor (c) an LED (d) a push button
  26. 26.Which of these is an output? (a) a push button (b) a light sensor (c) a buzzer (d) a keypad
  27. 27.Which of these is an input? (a) a speaker (b) a motor (c) a motion sensor (d) a buzzer
  28. 28.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) a temperature sensor (d) a motion sensor
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  31. 31.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  32. 32.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  35. 35.🔍 Which is the odd one out? (a) a light sensor (b) a servo motor (c) a buzzer (d) a speaker
  36. 36.Which of these is an output? (a) a small display (b) a push button (c) a light sensor (d) a motion sensor
  37. 37.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) a temperature sensor (d) a push button
  38. 38.Which of these is an output? (a) a keypad (b) a light sensor (c) a motion sensor (d) a water pump
  39. 39.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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