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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 878 · 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.Which of these is an input? (a) a servo motor (b) a sound sensor (c) a motor (d) a small display
  3. 3.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  6. 6.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) an LED (d) a temperature sensor
  7. 7.Which of these is an input? (a) a motor (b) a light sensor (c) a buzzer (d) a small display
  8. 8.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.True or false: “many values in a range” is an analog signal. (a) True (b) False
  12. 12.True or false: “the room temperature” is an analog signal. (a) False (b) True
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  17. 17.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a water pump (d) a sound sensor
  19. 19.🔍 Which is the odd one out? (a) a small display (b) a motor (c) a sound sensor (d) a buzzer
  20. 20.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a servo motor (d) an LED
  21. 21.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  22. 22.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.Which of these is an input? (a) a servo motor (b) a motor (c) an LED (d) a motion sensor
  24. 24.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  25. 25.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.📶 Digital or analog: the room temperature? (a) analog (b) digital
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  31. 31.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a push button (d) a temperature sensor
  33. 33.📶 How many states can a digital pin have? (a) two (b) ten (c) a thousand (d) one
  34. 34.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  35. 35.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  39. 39.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a servo motor
  40. 40.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital

Answer key

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

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