← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 456 · 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  5. 5.Which of these is an output? (a) a push button (b) an LED (c) a sound sensor (d) a light sensor
  6. 6.📶 Digital or analog: the room temperature? (a) analog (b) digital
  7. 7.📶 Digital or analog: many values in a range? (a) analog (b) digital
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
  10. 10.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  12. 12.Which of these is an input? (a) an LED (b) a small display (c) a light sensor (d) a speaker
  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 8 HIGH
    set pin 8 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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.Which of these is an input? (a) an LED (b) a keypad (c) a motor (d) a speaker
  16. 16.Which of these is an input? (a) a motor (b) a speaker (c) an LED (d) a turning knob
  17. 17.True or false: “the room temperature” is an analog 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.Which of these is an output? (a) a light sensor (b) a motor (c) a push button (d) a motion sensor
  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 8 LOW
    set pin 7 HIGH
    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) 0 V (b) 9 V (c) 5 V (d) 1.5 V
  22. 22.🔍 Which is the odd one out? (a) a speaker (b) a keypad (c) a water pump (d) a buzzer
  23. 23.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  24. 24.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  25. 25.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  26. 26.💡 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
  27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 230 V (d) 5 V
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔍 Which is the odd one out? (a) an LED (b) a sound sensor (c) a turning knob (d) a keypad
  31. 31.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  32. 32.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) a light sensor (d) a push button
  33. 33.Which of these is an input? (a) an LED (b) a push button (c) a water pump (d) a speaker
  34. 34.💡 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
    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
  35. 35.💡 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 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  37. 37.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  38. 38.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  39. 39.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  40. 40.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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