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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 637 · 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.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  2. 2.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  3. 3.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  4. 4.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  5. 5.💡 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 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.Which of these is an output? (a) a sound sensor (b) a turning knob (c) a temperature sensor (d) a servo motor
  7. 7.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a push button (d) a small display
  9. 9.🔍 Which is the odd one out? (a) a water pump (b) a keypad (c) a speaker (d) a servo motor
  10. 10.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  11. 11.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  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 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  14. 14.📶 How many states can a digital pin have? (a) a thousand (b) one (c) ten (d) two
  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 7 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.💡 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
  17. 17.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  20. 20.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a sound sensor (d) a motor
  21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) an LED (c) a turning knob (d) a push button
  22. 22.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  23. 23.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a temperature sensor (d) a keypad
  24. 24.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  25. 25.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  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 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  28. 28.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  29. 29.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an output? (a) a buzzer (b) a light sensor (c) a keypad (d) a sound sensor
  33. 33.📶 Digital or analog: the room temperature? (a) digital (b) analog
  34. 34.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  35. 35.🔍 Which is the odd one out? (a) a water pump (b) a sound sensor (c) a buzzer (d) a servo motor
  36. 36.Which of these is an input? (a) a light sensor (b) an LED (c) a water pump (d) a buzzer
  37. 37.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  40. 40.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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