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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 724 · 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 of these is an output? (a) a temperature sensor (b) a light sensor (c) a servo motor (d) a turning knob
  2. 2.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  3. 3.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  4. 4.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  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 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 50 V (d) 230 V
  8. 8.🔍 Which is the odd one out? (a) a sound sensor (b) a temperature sensor (c) a push button (d) a small display
  9. 9.📶 Digital or analog: many values in a range? (a) digital (b) analog
  10. 10.Which of these is an input? (a) a water pump (b) a light sensor (c) a motor (d) a speaker
  11. 11.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔍 Which is the odd one out? (a) a servo motor (b) a push button (c) an LED (d) a small display
  13. 13.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  16. 16.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  17. 17.True or false: “many values in a range” is an analog signal. (a) True (b) False
  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 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  19. 19.💡 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 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    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 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
  21. 21.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  22. 22.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  23. 23.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  24. 24.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  25. 25.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a speaker (d) a buzzer
  26. 26.Which of these is an output? (a) a light sensor (b) a motion sensor (c) a push button (d) a motor
  27. 27.Which of these is an input? (a) a speaker (b) a keypad (c) an LED (d) a motor
  28. 28.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  29. 29.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 9 V (d) 0 V
  30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a temperature sensor (d) a buzzer
  33. 33.📶 How many states can a digital pin have? (a) one (b) ten (c) a thousand (d) two
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 An LED (with its resistor) is on pin 8. 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) ON (b) OFF
  36. 36.🔍 Which is the odd one out? (a) a water pump (b) a buzzer (c) a motion sensor (d) a small display
  37. 37.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
  39. 39.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.💡 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) ON (b) OFF

Answer key

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

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