← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 483 · 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.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  2. 2.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  3. 3.💡 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 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) a motor (d) a push button
  5. 5.Which of these is an output? (a) a push button (b) a speaker (c) a keypad (d) a motion sensor
  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 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  8. 8.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  9. 9.Which of these is an input? (a) a motor (b) a temperature sensor (c) an LED (d) a buzzer
  10. 10.📶 Digital or analog: the room temperature? (a) analog (b) digital
  11. 11.Which of these is an input? (a) a light sensor (b) a servo motor (c) a small display (d) an LED
  12. 12.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a turning knob (d) an LED
  14. 14.Which of these is an input? (a) a servo motor (b) a water pump (c) a buzzer (d) a turning knob
  15. 15.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
  16. 16.🔍 Which is the odd one out? (a) a small display (b) an LED (c) a speaker (d) a temperature sensor
  17. 17.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  19. 19.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 9 V (d) 5 V
  22. 22.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a speaker (d) a push button
  23. 23.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.Which of these is an input? (a) a small display (b) a buzzer (c) a push button (d) a motor
  25. 25.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) an LED
  28. 28.Which of these is an output? (a) a turning knob (b) a small display (c) a push button (d) a light sensor
  29. 29.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  30. 30.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  31. 31.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  32. 32.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  33. 33.💡 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 8 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.Which of these is an input? (a) a servo motor (b) a water pump (c) a speaker (d) a sound sensor
  35. 35.💡 An LED (with its resistor) is on pin 8. 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
  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 8 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.Which of these is an output? (a) a temperature sensor (b) a turning knob (c) a water pump (d) a push button
  38. 38.💡 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
  39. 39.💡 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) ON (b) OFF
  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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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