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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 819 · 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.

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

Answer key

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

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