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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 361 · 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 sound sensor (c) a keypad (d) a buzzer
  2. 2.💡 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 7 HIGH
    set pin 8 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 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
  4. 4.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  6. 6.True or false: “many values in a range” is an analog signal. (a) False (b) True
  7. 7.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  9. 9.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  10. 10.Which of these is an input? (a) a water pump (b) a speaker (c) a temperature sensor (d) a servo motor
  11. 11.🔍 Which is the odd one out? (a) a keypad (b) a motion sensor (c) a turning knob (d) a speaker
  12. 12.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) a battery (d) an output
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  14. 14.💡 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 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  15. 15.Which of these is an input? (a) a motor (b) a water pump (c) a push button (d) a servo motor
  16. 16.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  19. 19.Which of these is an output? (a) a motion sensor (b) an LED (c) a push button (d) a sound sensor
  20. 20.Which of these is an output? (a) a servo motor (b) a push button (c) a sound sensor (d) a turning knob
  21. 21.Which of these is an input? (a) a buzzer (b) a water pump (c) a turning knob (d) a speaker
  22. 22.Which of these is an output? (a) a motion sensor (b) a temperature sensor (c) a turning knob (d) a motor
  23. 23.💡 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
  24. 24.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a buzzer (d) a water pump
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  26. 26.Which of these is an output? (a) a turning knob (b) a water pump (c) a motion sensor (d) a sound sensor
  27. 27.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  28. 28.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  29. 29.Which of these is an input? (a) a buzzer (b) a motor (c) a water pump (d) a keypad
  30. 30.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  32. 32.🔍 Which is the odd one out? (a) an LED (b) a light sensor (c) a motor (d) a buzzer
  33. 33.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  34. 34.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.Which of these is an output? (a) a speaker (b) a temperature sensor (c) a keypad (d) a turning knob
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.📶 Digital or analog: many values in a range? (a) analog (b) digital
  38. 38.Which of these is an input? (a) a servo motor (b) a water pump (c) a motion sensor (d) an LED
  39. 39.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  40. 40.True or false: “a door: open or shut” is an analog signal. (a) True (b) False

Answer key

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

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