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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 773 · 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.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  2. 2.💡 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) OFF (b) ON
  3. 3.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  4. 4.💡 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
  5. 5.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  6. 6.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
  7. 7.Which of these is an input? (a) a buzzer (b) a servo motor (c) an LED (d) a push button
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an output (d) an input
  10. 10.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.True or false: “a knob turned part way” 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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  14. 14.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a push button (d) a small display
  15. 15.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  17. 17.Which of these is an output? (a) a sound sensor (b) a push button (c) a keypad (d) a servo motor
  18. 18.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) a buzzer (d) a push button
  19. 19.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  20. 20.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a small display (c) a temperature sensor (d) a push button
  22. 22.Which of these is an input? (a) a buzzer (b) an LED (c) a light sensor (d) a speaker
  23. 23.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an input? (a) an LED (b) a motion sensor (c) a servo motor (d) a buzzer
  25. 25.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a servo motor (d) a water pump
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 5 V (d) 0 V
  28. 28.True or false: “the room temperature” is a digital signal. (a) False (b) True
  29. 29.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  30. 30.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  32. 32.True or false: “many values in a range” is a digital signal. (a) False (b) True
  33. 33.💡 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
  34. 34.Which of these is an output? (a) a push button (b) a water pump (c) a temperature sensor (d) a light sensor
  35. 35.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  38. 38.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  40. 40.💡 An LED (with its resistor) is on pin 8. 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) OFF (b) ON

Answer key

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

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