← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 257 · 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.💡 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
    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
  2. 2.📶 Digital or analog: the room temperature? (a) digital (b) analog
  3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  5. 5.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  6. 6.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  7. 7.🔍 Which is the odd one out? (a) a buzzer (b) a keypad (c) a turning knob (d) a sound sensor
  8. 8.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  9. 9.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 5 V (d) 0 V
  11. 11.Which of these is an input? (a) a speaker (b) a buzzer (c) a light sensor (d) a servo motor
  12. 12.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  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 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  14. 14.💡 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  16. 16.💡 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
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  17. 17.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  18. 18.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  19. 19.💡 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 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.Which of these is an input? (a) a speaker (b) a buzzer (c) a water pump (d) a push button
  21. 21.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  22. 22.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  23. 23.Which of these is an input? (a) a keypad (b) a servo motor (c) a motor (d) a speaker
  24. 24.Which of these is an input? (a) a buzzer (b) a temperature sensor (c) a speaker (d) a motor
  25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.Which of these is an output? (a) a light sensor (b) a small display (c) a motion sensor (d) a keypad
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.Which of these is an output? (a) a servo motor (b) a keypad (c) a push button (d) a sound sensor
  29. 29.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a push button (d) a speaker
  33. 33.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  36. 36.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  39. 39.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.True or false: “how loud a sound is” is an analog signal. (a) True (b) False

Answer key

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

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