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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 659 · 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.Which of these is an input? (a) an LED (b) a motion sensor (c) a speaker (d) a water pump
  2. 2.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a water pump (d) a push button
  3. 3.Which of these is an input? (a) a speaker (b) a turning knob (c) a water pump (d) a small display
  4. 4.💡 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
  5. 5.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  6. 6.💡 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 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an input? (a) a small display (b) a speaker (c) a buzzer (d) a temperature sensor
  8. 8.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  11. 11.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 50 V (d) 230 V
  16. 16.Which of these is an output? (a) a temperature sensor (b) a servo motor (c) a keypad (d) a light sensor
  17. 17.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  18. 18.💡 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 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a motion sensor (d) a push button
  20. 20.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  21. 21.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a small display
  22. 22.Which of these is an output? (a) a light sensor (b) a motor (c) a turning knob (d) a motion sensor
  23. 23.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  25. 25.🔍 Which is the odd one out? (a) a light sensor (b) an LED (c) a water pump (d) a motor
  26. 26.📶 Digital or analog: the room temperature? (a) analog (b) digital
  27. 27.🔍 Which is the odd one out? (a) a motor (b) a push button (c) a keypad (d) a motion sensor
  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 7 HIGH
    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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔍 Which is the odd one out? (a) an LED (b) a keypad (c) a temperature sensor (d) a sound sensor
  31. 31.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a turning knob (d) a light sensor
  32. 32.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  34. 34.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  36. 36.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  37. 37.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.💡 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 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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