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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 836 · 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.Which of these is an input? (a) a motor (b) a servo motor (c) a light sensor (d) a water pump
  2. 2.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  4. 4.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.Which of these is an input? (a) a small display (b) a servo motor (c) a turning knob (d) a water pump
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  8. 8.🔍 Which is the odd one out? (a) a motor (b) a push button (c) a buzzer (d) a small display
  9. 9.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  10. 10.💡 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
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  11. 11.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  12. 12.📶 How many states can a digital pin have? (a) a thousand (b) two (c) one (d) ten
  13. 13.🔌 Is a push button 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 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  16. 16.Which of these is an output? (a) a motor (b) a light sensor (c) a turning knob (d) a motion sensor
  17. 17.💡 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
    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
  18. 18.Which of these is an output? (a) a turning knob (b) a light sensor (c) a keypad (d) an LED
  19. 19.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  20. 20.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a light sensor (d) a sound sensor
  21. 21.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  22. 22.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  23. 23.🔍 Which is the odd one out? (a) a keypad (b) a speaker (c) an LED (d) a small display
  24. 24.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  25. 25.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  27. 27.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  29. 29.💡 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
    set pin 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  31. 31.💡 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 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.Which of these is an input? (a) a servo motor (b) a temperature sensor (c) a motor (d) a small display
  33. 33.💡 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
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  34. 34.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  35. 35.💡 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) ON (b) OFF
  36. 36.Which of these is an input? (a) a water pump (b) a buzzer (c) a servo motor (d) a push button
  37. 37.True or false: “many values in a range” is a digital signal. (a) True (b) False
  38. 38.Which of these is an input? (a) a water pump (b) an LED (c) a buzzer (d) a sound sensor
  39. 39.💡 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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  40. 40.📶 Digital or analog: the room temperature? (a) digital (b) analog

Answer key

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

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