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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 351 · 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 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.💡 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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.🔍 Which is the odd one out? (a) a water pump (b) an LED (c) a speaker (d) a keypad
  8. 8.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a motor (d) a sound sensor
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  10. 10.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a servo motor (d) an LED
  11. 11.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  12. 12.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a turning knob (d) a push button
  13. 13.💡 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 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  15. 15.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  16. 16.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  19. 19.Which of these is an output? (a) a light sensor (b) a motor (c) a temperature sensor (d) a push button
  20. 20.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  22. 22.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an output? (a) a sound sensor (b) a temperature sensor (c) a servo motor (d) a turning knob
  25. 25.Which of these is an input? (a) a buzzer (b) a sound sensor (c) a water pump (d) a servo motor
  26. 26.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.Which of these is an input? (a) a keypad (b) a buzzer (c) a motor (d) a speaker
  28. 28.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  29. 29.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  31. 31.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  32. 32.True or false: “HIGH or LOW only” 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  35. 35.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  39. 39.🔍 Which is the odd one out? (a) a servo motor (b) a water pump (c) a buzzer (d) a motion sensor
  40. 40.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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