← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 71 · 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 buzzer (b) an LED (c) a servo motor (d) a motion sensor
  2. 2.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  3. 3.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.🔍 Which is the odd one out? (a) a keypad (b) a speaker (c) a buzzer (d) an LED
  5. 5.📶 How many states can a digital pin have? (a) two (b) one (c) ten (d) a thousand
  6. 6.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  7. 7.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  8. 8.Which of these is an output? (a) a light sensor (b) a small display (c) a turning knob (d) a sound sensor
  9. 9.True or false: “many values in a range” is a digital signal. (a) False (b) True
  10. 10.💡 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 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 Digital or analog: many values in a range? (a) digital (b) analog
  12. 12.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  14. 14.📶 Digital or analog: the room temperature? (a) analog (b) digital
  15. 15.💡 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
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  19. 19.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  20. 20.🔍 Which is the odd one out? (a) a sound sensor (b) a push button (c) a servo motor (d) a turning knob
  21. 21.📶 A pin that reads a push button is set as … (a) a resistor (b) a battery (c) an input (d) an output
  22. 22.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  23. 23.💡 An LED (with its resistor) is on pin 8. 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
  24. 24.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  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 water pump (b) a sound sensor (c) a speaker (d) a motor
  27. 27.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  28. 28.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  32. 32.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  33. 33.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a motor (d) a turning knob
  34. 34.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  35. 35.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) an LED (d) a turning knob
  36. 36.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  37. 37.🔍 Which is the odd one out? (a) a water pump (b) a motor (c) a buzzer (d) a light sensor
  38. 38.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  39. 39.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  40. 40.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a speaker (d) a motor

Answer key

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

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