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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 374 · 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 of these is an input? (a) an LED (b) a sound sensor (c) a speaker (d) a servo motor
  2. 2.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a motor (d) a speaker
  3. 3.🔍 Which is the odd one out? (a) a turning knob (b) a buzzer (c) a temperature sensor (d) a motion sensor
  4. 4.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  5. 5.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  6. 6.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 How many states can a digital pin have? (a) a thousand (b) two (c) ten (d) one
  8. 8.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  11. 11.💡 An LED (with its resistor) is on pin 7. 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
  12. 12.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  13. 13.💡 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 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a temperature sensor (d) a push button
  15. 15.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  16. 16.Which of these is an output? (a) a push button (b) a temperature sensor (c) a motion sensor (d) a servo motor
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    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
  18. 18.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  19. 19.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  21. 21.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  22. 22.💡 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 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  24. 24.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a servo motor (d) a buzzer
  25. 25.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  26. 26.Which of these is an input? (a) a servo motor (b) a temperature sensor (c) a speaker (d) a motor
  27. 27.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a temperature sensor (d) a motor
  28. 28.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
  29. 29.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  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 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  34. 34.🔍 Which is the odd one out? (a) a motion sensor (b) a servo motor (c) a push button (d) a temperature sensor
  35. 35.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a speaker (d) a sound sensor
  36. 36.Which of these is an input? (a) a motion sensor (b) a motor (c) a small display (d) a buzzer
  37. 37.True or false: “many values in a range” is an analog signal. (a) True (b) False
  38. 38.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  39. 39.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 0 V (d) 1.5 V
  40. 40.📶 Digital or analog: how loud a sound is? (a) analog (b) digital

Answer key

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

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