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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 524 · 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.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  2. 2.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a keypad (d) a small display
  3. 3.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a buzzer (d) a keypad
  4. 4.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
  5. 5.💡 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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  7. 7.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.💡 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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  14. 14.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  15. 15.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  17. 17.Which of these is an input? (a) an LED (b) a small display (c) a water pump (d) a push button
  18. 18.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  20. 20.📶 Digital or analog: the room temperature? (a) digital (b) analog
  21. 21.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  22. 22.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) a resistor (d) an output
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  26. 26.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.Which of these is an output? (a) a keypad (b) a servo motor (c) a light sensor (d) a push button
  28. 28.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    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
  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 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.Which of these is an input? (a) a water pump (b) a keypad (c) a motor (d) an LED
  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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a motor (d) a speaker
  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 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a water pump
  37. 37.💡 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) ON (b) OFF
  38. 38.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  40. 40.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a servo motor (d) a light sensor

Answer key

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

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