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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 353 · 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) a speaker (b) an LED (c) a turning knob (d) a water pump
  2. 2.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  3. 3.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  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 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.Which of these is an input? (a) a servo motor (b) a sound sensor (c) a buzzer (d) an LED
  6. 6.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) an LED (d) a temperature sensor
  7. 7.💡 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) ON (b) OFF
  8. 8.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  10. 10.Which of these is an input? (a) an LED (b) a small display (c) a buzzer (d) a temperature sensor
  11. 11.🔍 Which is the odd one out? (a) a water pump (b) a push button (c) a light sensor (d) a keypad
  12. 12.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  16. 16.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  18. 18.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a speaker
  19. 19.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) an output (d) a battery
  20. 20.🔍 Which is the odd one out? (a) a servo motor (b) an LED (c) a push button (d) a buzzer
  21. 21.Which of these is an input? (a) a servo motor (b) a motor (c) a motion sensor (d) a speaker
  22. 22.True or false: “many values in a range” is an analog signal. (a) False (b) True
  23. 23.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  26. 26.💡 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
  27. 27.💡 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
  28. 28.True or false: “the room temperature” is a digital signal. (a) True (b) False
  29. 29.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  30. 30.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  31. 31.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  32. 32.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.True or false: “many values in a range” is a digital signal. (a) True (b) False
  34. 34.Which of these is an input? (a) a water pump (b) a keypad (c) a buzzer (d) a motor
  35. 35.Which of these is an output? (a) a motion sensor (b) a small display (c) a keypad (d) a turning knob
  36. 36.💡 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
  37. 37.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  38. 38.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  39. 39.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔍 Which is the odd one out? (a) a water pump (b) a temperature sensor (c) a buzzer (d) an LED

Answer key

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

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