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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 337 · 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 input? (a) a buzzer (b) a small display (c) a servo motor (d) a light sensor
  2. 2.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  3. 3.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a turning knob (d) an LED
  4. 4.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  5. 5.Which of these is an input? (a) a speaker (b) a turning knob (c) a motor (d) a small display
  6. 6.🔍 Which is the odd one out? (a) a keypad (b) a water pump (c) a push button (d) a motion sensor
  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 LOW
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  8. 8.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.Which of these is an input? (a) a water pump (b) a speaker (c) a motor (d) a temperature sensor
  10. 10.Which of these is an output? (a) a keypad (b) a light sensor (c) a sound sensor (d) a speaker
  11. 11.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  12. 12.Which of these is an input? (a) a servo motor (b) an LED (c) a sound sensor (d) a buzzer
  13. 13.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  16. 16.🔍 Which is the odd one out? (a) a push button (b) a turning knob (c) a small display (d) a light sensor
  17. 17.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  18. 18.Which of these is an output? (a) a push button (b) an LED (c) a light sensor (d) a motion sensor
  19. 19.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a servo motor (d) a keypad
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  21. 21.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  22. 22.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a servo motor (d) a buzzer
  23. 23.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  24. 24.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  29. 29.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  30. 30.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  31. 31.Which of these is an output? (a) a turning knob (b) a keypad (c) a motion sensor (d) a servo motor
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.💡 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 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  38. 38.💡 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
  39. 39.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  40. 40.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output

Answer key

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

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