← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 317 · 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 servo motor (b) a water pump (c) a speaker (d) a keypad
  2. 2.💡 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) ON (b) OFF
  3. 3.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  4. 4.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  5. 5.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.💡 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
  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 7 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  9. 9.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  10. 10.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  11. 11.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a light sensor (d) a buzzer
  12. 12.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
  13. 13.💡 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
  14. 14.🔍 Which is the odd one out? (a) a temperature sensor (b) a water pump (c) a push button (d) a turning knob
  15. 15.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  16. 16.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  17. 17.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.💡 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
  19. 19.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) an LED (d) a buzzer
  20. 20.📶 Digital or analog: many values in a range? (a) digital (b) analog
  21. 21.🔍 Which is the odd one out? (a) a motion sensor (b) a light sensor (c) a push button (d) an LED
  22. 22.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a water pump (d) a sound sensor
  23. 23.Which of these is an input? (a) an LED (b) a small display (c) a sound sensor (d) a buzzer
  24. 24.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  25. 25.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  27. 27.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  29. 29.💡 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
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.Which of these is an output? (a) a water pump (b) a keypad (c) a sound sensor (d) a push button
  31. 31.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  32. 32.🔍 Which is the odd one out? (a) a small display (b) a buzzer (c) a motor (d) a temperature sensor
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔍 Which is the odd one out? (a) a motor (b) a water pump (c) a push button (d) a servo motor
  35. 35.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  36. 36.Which of these is an output? (a) a temperature sensor (b) a buzzer (c) a sound sensor (d) a push button
  37. 37.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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) OFF (b) ON
  39. 39.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  40. 40.📶 Digital or analog: a knob turned part way? (a) digital (b) analog

Answer key

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

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