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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 600 · 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.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  2. 2.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  3. 3.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  4. 4.Which of these is an output? (a) a sound sensor (b) a buzzer (c) a keypad (d) a turning knob
  5. 5.Which of these is an input? (a) a water pump (b) a speaker (c) an LED (d) a sound sensor
  6. 6.Which of these is an output? (a) a turning knob (b) an LED (c) a push button (d) a light sensor
  7. 7.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.Which of these is an input? (a) a small display (b) an LED (c) a turning knob (d) a servo motor
  9. 9.💡 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
    set pin 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.True or false: “many values in a range” is a digital signal. (a) False (b) True
  11. 11.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a sound sensor (d) a motor
  12. 12.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  13. 13.Which of these is an output? (a) a keypad (b) a turning knob (c) a push button (d) a water pump
  14. 14.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
  16. 16.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  18. 18.🔍 Which is the odd one out? (a) a light sensor (b) a speaker (c) a buzzer (d) an LED
  19. 19.💡 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
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.Which of these is an input? (a) an LED (b) a speaker (c) a buzzer (d) a keypad
  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 8 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  23. 23.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  25. 25.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  28. 28.Which of these is an input? (a) an LED (b) a speaker (c) a servo motor (d) a light sensor
  29. 29.Which of these is an input? (a) a motion sensor (b) a small display (c) an LED (d) a motor
  30. 30.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  31. 31.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 5 V (d) 9 V
  32. 32.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  33. 33.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) a speaker (d) a keypad
  34. 34.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
  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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a small display (d) an LED
  39. 39.Which of these is an output? (a) a turning knob (b) a speaker (c) a motion sensor (d) a temperature sensor
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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