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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 500 · 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.📶 How many states can a digital pin have? (a) two (b) a thousand (c) one (d) ten
  2. 2.🔍 Which is the odd one out? (a) a speaker (b) a buzzer (c) a sound sensor (d) a small display
  3. 3.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔌 Is a water pump 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 HIGH
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.🔍 Which is the odd one out? (a) a light sensor (b) a turning knob (c) a buzzer (d) a keypad
  8. 8.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  10. 10.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  11. 11.🔍 Which is the odd one out? (a) a buzzer (b) a small display (c) a speaker (d) a motion sensor
  12. 12.💡 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
  13. 13.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  14. 14.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  15. 15.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  16. 16.💡 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) OFF (b) ON
  17. 17.💡 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
  18. 18.🔍 Which is the odd one out? (a) a servo motor (b) a motor (c) a temperature sensor (d) a small display
  19. 19.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a temperature sensor (d) a keypad
  20. 20.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  21. 21.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.🔍 Which is the odd one out? (a) a motion sensor (b) a keypad (c) a speaker (d) a turning knob
  23. 23.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 0 V (d) 9 V
  24. 24.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  25. 25.Which of these is an input? (a) a buzzer (b) a speaker (c) a temperature sensor (d) an LED
  26. 26.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  27. 27.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  28. 28.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  29. 29.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  30. 30.Which of these is an output? (a) a buzzer (b) a turning knob (c) a temperature sensor (d) a keypad
  31. 31.💡 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 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  33. 33.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  34. 34.True or false: “the room temperature” is an analog signal. (a) True (b) False
  35. 35.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  36. 36.Which of these is an input? (a) a buzzer (b) a turning knob (c) an LED (d) a speaker
  37. 37.💡 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
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.True or false: “many values in a range” is an analog signal. (a) False (b) True
  40. 40.True or false: “the room temperature” is a digital signal. (a) True (b) False

Answer key

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

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