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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 311 · 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.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  3. 3.Which of these is an output? (a) a sound sensor (b) a light sensor (c) a small display (d) a temperature sensor
  4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  5. 5.Which of these is an output? (a) a motor (b) a push button (c) a motion sensor (d) a temperature sensor
  6. 6.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  7. 7.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  8. 8.💡 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.💡 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 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  14. 14.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
  15. 15.Which of these is an input? (a) a motor (b) a light sensor (c) a buzzer (d) a small display
  16. 16.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  17. 17.📶 A pin set LOW gives about … (a) 5 V (b) 9 V (c) 0 V (d) 1.5 V
  18. 18.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
  19. 19.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  20. 20.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  21. 21.💡 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
  22. 22.📶 Digital or analog: the room temperature? (a) digital (b) analog
  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
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.🔍 Which is the odd one out? (a) a temperature sensor (b) a servo motor (c) a small display (d) a speaker
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.🔍 Which is the odd one out? (a) a speaker (b) a motion sensor (c) a buzzer (d) a small display
  29. 29.True or false: “how loud a sound is” is a digital signal. (a) False (b) True
  30. 30.Which of these is an output? (a) a push button (b) a buzzer (c) a light sensor (d) a motion sensor
  31. 31.📶 Digital or analog: many values in a range? (a) analog (b) digital
  32. 32.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  36. 36.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  39. 39.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
  40. 40.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False

Answer key

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

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