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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 333 · 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 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.Which of these is an output? (a) a motion sensor (b) a push button (c) a water pump (d) a keypad
  3. 3.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  4. 4.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.Which of these is an input? (a) a speaker (b) a motor (c) a push button (d) a small display
  7. 7.🔍 Which is the odd one out? (a) a servo motor (b) a small display (c) a water pump (d) a light sensor
  8. 8.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  10. 10.🔍 Which is the odd one out? (a) a push button (b) a keypad (c) a motion sensor (d) a water pump
  11. 11.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
  12. 12.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  14. 14.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  15. 15.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  16. 16.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) an LED (d) a turning knob
  20. 20.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.🔍 Which is the odd one out? (a) a motion sensor (b) a turning knob (c) a small display (d) a push button
  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 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.📶 Digital or analog: many values in a range? (a) digital (b) analog
  25. 25.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  26. 26.🔍 Which is the odd one out? (a) a motion sensor (b) a motor (c) a push button (d) a turning knob
  27. 27.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  28. 28.Which of these is an input? (a) a servo motor (b) a keypad (c) a speaker (d) a motor
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
  32. 32.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a small display (d) a servo motor
  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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  35. 35.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  36. 36.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  37. 37.💡 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
    set pin 7 HIGH
    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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.🔍 Which is the odd one out? (a) a speaker (b) a keypad (c) a buzzer (d) a motor
  40. 40.💡 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

Answer key

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

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