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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 251 · 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 is the odd one out? (a) a water pump (b) an LED (c) a buzzer (d) a keypad
  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 8 LOW
    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
  3. 3.Which of these is an input? (a) a buzzer (b) a speaker (c) a temperature sensor (d) a small display
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  6. 6.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 A pin set LOW gives about … (a) 0 V (b) 9 V (c) 1.5 V (d) 5 V
  8. 8.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔍 Which is the odd one out? (a) a push button (b) a light sensor (c) a keypad (d) an LED
  10. 10.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  11. 11.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  12. 12.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  14. 14.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  15. 15.True or false: “the room temperature” is a digital signal. (a) False (b) True
  16. 16.Which of these is an input? (a) a keypad (b) a water pump (c) a motor (d) a speaker
  17. 17.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a keypad (d) a small display
  19. 19.📶 How many states can a digital pin have? (a) ten (b) one (c) a thousand (d) two
  20. 20.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  21. 21.Which of these is an output? (a) a push button (b) a speaker (c) a temperature sensor (d) a turning knob
  22. 22.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  23. 23.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  24. 24.Which of these is an output? (a) a motor (b) a temperature sensor (c) a sound sensor (d) a keypad
  25. 25.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a water pump (d) a push button
  26. 26.📶 Digital or analog: many values in a range? (a) analog (b) digital
  27. 27.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a servo motor (d) a temperature sensor
  28. 28.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  31. 31.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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) OFF (b) ON
  33. 33.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.Which of these is an input? (a) a small display (b) a servo motor (c) a speaker (d) a light sensor
  35. 35.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  36. 36.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 5 V (c) 0 V (d) 50 V
  38. 38.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  39. 39.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True

Answer key

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

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