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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 604 · 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.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  2. 2.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  3. 3.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  4. 4.Which of these is an input? (a) a speaker (b) a water pump (c) a motion sensor (d) a buzzer
  5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    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
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.Which of these is an input? (a) a servo motor (b) a buzzer (c) a keypad (d) an LED
  8. 8.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a servo motor (d) a light sensor
  9. 9.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 5 V (c) 230 V (d) 50 V
  13. 13.Which of these is an output? (a) a keypad (b) a push button (c) an LED (d) a motion sensor
  14. 14.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  15. 15.True or false: “many values in a range” is an analog signal. (a) True (b) False
  16. 16.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  17. 17.Which of these is an output? (a) a servo motor (b) a sound sensor (c) a temperature sensor (d) a keypad
  18. 18.Which of these is an input? (a) a small display (b) a water pump (c) a temperature sensor (d) a buzzer
  19. 19.🔍 Which is the odd one out? (a) a motor (b) a sound sensor (c) an LED (d) a water pump
  20. 20.Which of these is an input? (a) a push button (b) a buzzer (c) a servo motor (d) an LED
  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
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  22. 22.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
  23. 23.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  24. 24.Which of these is an output? (a) a buzzer (b) a push button (c) a motion sensor (d) a temperature sensor
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  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 7 LOW
    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
  28. 28.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
  29. 29.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  30. 30.💡 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
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  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
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔍 Which is the odd one out? (a) a turning knob (b) a temperature sensor (c) a speaker (d) a keypad
  34. 34.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 An LED (with its resistor) is on pin 7. 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 LOW
    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 8 LOW
    set pin 8 HIGH
    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
  38. 38.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.Which of these is an output? (a) a motion sensor (b) a keypad (c) a temperature sensor (d) a speaker
  40. 40.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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