← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 881 · 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.

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

Answer key

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

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids