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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 420 · 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.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  2. 2.🔍 Which is the odd one out? (a) a light sensor (b) a motion sensor (c) a turning knob (d) a servo motor
  3. 3.True or false: “a door: open or shut” is an analog signal. (a) False (b) True
  4. 4.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  5. 5.📶 How many states can a digital pin have? (a) one (b) two (c) a thousand (d) ten
  6. 6.True or false: “how bright a room is” is a digital signal. (a) True (b) False
  7. 7.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  9. 9.📶 Digital or analog: many values in a range? (a) analog (b) digital
  10. 10.Which of these is an input? (a) an LED (b) a motor (c) a light sensor (d) a buzzer
  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 7 LOW
    set pin 7 LOW
    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 LOW
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  13. 13.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  14. 14.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  15. 15.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  17. 17.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  18. 18.🔍 Which is the odd one out? (a) a motor (b) a temperature sensor (c) a light sensor (d) a turning knob
  19. 19.💡 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
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  20. 20.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) a battery (d) an input
  21. 21.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  22. 22.True or false: “many values in a range” is a digital signal. (a) True (b) False
  23. 23.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  24. 24.📶 Digital or analog: the room temperature? (a) digital (b) analog
  25. 25.Which of these is an input? (a) a push button (b) a water pump (c) a speaker (d) an LED
  26. 26.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 LOW
    set pin 8 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 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  30. 30.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a temperature sensor (d) a turning knob
  31. 31.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  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 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 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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 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 8. All pins start LOW. The program runs once:
    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) ON (b) OFF
  37. 37.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  38. 38.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  40. 40.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False

Answer key

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

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