← Input and output pins lesson New set →

Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 789 · 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
  5. 5.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔍 Which is the odd one out? (a) an LED (b) a speaker (c) a turning knob (d) a water pump
  7. 7.🔍 Which is the odd one out? (a) a water pump (b) a speaker (c) a buzzer (d) a push button
  8. 8.Which of these is an input? (a) an LED (b) a small display (c) a motor (d) a sound sensor
  9. 9.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  12. 12.📶 Digital or analog: the room temperature? (a) analog (b) digital
  13. 13.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a light sensor (d) an LED
  14. 14.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  15. 15.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔍 Which is the odd one out? (a) a motion sensor (b) a push button (c) a servo motor (d) a light sensor
  17. 17.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  18. 18.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  19. 19.💡 An LED (with its resistor) is on pin 7. 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) OFF (b) ON
  20. 20.💡 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
  21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  22. 22.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  23. 23.📶 A pin set LOW gives about … (a) 0 V (b) 1.5 V (c) 5 V (d) 9 V
  24. 24.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
  25. 25.🔍 Which is the odd one out? (a) a buzzer (b) a motor (c) an LED (d) a temperature sensor
  26. 26.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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) ON (b) OFF
  28. 28.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    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
  29. 29.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  30. 30.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a sound sensor (d) a turning knob
  31. 31.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  33. 33.Which of these is an input? (a) a motor (b) a turning knob (c) a servo motor (d) an LED
  34. 34.Which of these is an output? (a) a servo motor (b) a push button (c) a turning knob (d) a temperature sensor
  35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  36. 36.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
  37. 37.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  38. 38.🔍 Which is the odd one out? (a) a sound sensor (b) a small display (c) a speaker (d) a motor
  39. 39.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  40. 40.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input

Answer key

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

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