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Electronics Worksheet: Input and Output Pins

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

Answer key

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

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