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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 640 · 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 7. All pins start LOW. The program runs once:
    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
  2. 2.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.Which of these is an input? (a) a buzzer (b) a water pump (c) an LED (d) a sound sensor
  4. 4.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  5. 5.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  6. 6.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  7. 7.Which of these is an input? (a) a push button (b) a servo motor (c) a buzzer (d) a speaker
  8. 8.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  9. 9.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a keypad (d) a turning knob
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a buzzer (d) a motor
  12. 12.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  13. 13.🔍 Which is the odd one out? (a) a push button (b) a motion sensor (c) a keypad (d) a servo motor
  14. 14.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  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 7 LOW
    set pin 7 HIGH
    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 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  17. 17.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  18. 18.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  19. 19.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  22. 22.True or false: “many values in a range” is a digital signal. (a) False (b) True
  23. 23.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a motor (d) a servo motor
  24. 24.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.📶 Digital or analog: the room temperature? (a) digital (b) analog
  26. 26.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  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 output? (a) a motion sensor (b) a temperature sensor (c) a water pump (d) a sound sensor
  29. 29.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    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
  32. 32.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  33. 33.💡 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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.Which of these is an input? (a) an LED (b) a turning knob (c) a motor (d) a small display
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔍 Which is the odd one out? (a) a speaker (b) a keypad (c) a servo motor (d) a water pump
  38. 38.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  39. 39.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  40. 40.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False

Answer key

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

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