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Electronics Worksheet: Input and Output Pins

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

Answer key

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

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