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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 754 · 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.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  2. 2.📶 A pin set LOW gives about … (a) 9 V (b) 5 V (c) 1.5 V (d) 0 V
  3. 3.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  4. 4.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  5. 5.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  6. 6.Which of these is an input? (a) a buzzer (b) a water pump (c) a motion sensor (d) a motor
  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 8 LOW
    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
  8. 8.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  9. 9.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
  11. 11.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  13. 13.Which of these is an input? (a) a servo motor (b) a water pump (c) a light sensor (d) a buzzer
  14. 14.🔍 Which is the odd one out? (a) a temperature sensor (b) a speaker (c) a servo motor (d) an LED
  15. 15.🔍 Which is the odd one out? (a) a keypad (b) a light sensor (c) a push button (d) a small display
  16. 16.Which of these is an output? (a) a keypad (b) a turning knob (c) a sound sensor (d) a speaker
  17. 17.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.📶 How many states can a digital pin have? (a) one (b) two (c) ten (d) a thousand
  19. 19.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.🔍 Which is the odd one out? (a) a temperature sensor (b) a push button (c) a sound sensor (d) a motor
  21. 21.Which of these is an output? (a) a push button (b) a turning knob (c) a keypad (d) a small display
  22. 22.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  23. 23.🔌 Is a push button an input or an output for a microcontroller? (a) input (b) output
  24. 24.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  26. 26.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  27. 27.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  28. 28.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.💡 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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.💡 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) OFF (b) ON
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  35. 35.Which of these is an input? (a) a water pump (b) a speaker (c) a buzzer (d) a keypad
  36. 36.Which of these is an input? (a) a speaker (b) a temperature sensor (c) a motor (d) a buzzer
  37. 37.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.Which of these is an output? (a) a buzzer (b) a motion sensor (c) a turning knob (d) a push button
  39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  40. 40.📶 Digital or analog: many values in a range? (a) analog (b) digital

Answer key

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

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