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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 956 · 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.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  2. 2.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  3. 3.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  6. 6.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  7. 7.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
  8. 8.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 230 V (d) 0 V
  9. 9.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  10. 10.🔍 Which is the odd one out? (a) a speaker (b) a small display (c) a servo motor (d) a turning knob
  11. 11.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  12. 12.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  14. 14.💡 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
  15. 15.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  16. 16.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  17. 17.💡 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
  18. 18.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  19. 19.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  20. 20.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  22. 22.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
  23. 23.🔍 Which is the odd one out? (a) a water pump (b) a light sensor (c) a motor (d) a buzzer
  24. 24.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
  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 8 LOW
    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
  26. 26.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) an LED (b) a buzzer (c) a small display (d) a temperature sensor
  29. 29.💡 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 7 LOW
    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 temperature sensor (b) a push button (c) a servo motor (d) a light sensor
  31. 31.💡 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
    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 8 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.Which of these is an input? (a) a buzzer (b) a water pump (c) a motor (d) a push button
  34. 34.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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
  36. 36.💡 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
  37. 37.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  39. 39.💡 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 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) an LED (d) a servo motor

Answer key

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

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