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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 844 · 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 output? (a) a small display (b) a motion sensor (c) a sound sensor (d) a push button
  2. 2.Which of these is an input? (a) a servo motor (b) a small display (c) an LED (d) a keypad
  3. 3.🔍 Which is the odd one out? (a) a turning knob (b) a motion sensor (c) a keypad (d) a small display
  4. 4.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  5. 5.True or false: “many values in a range” is a digital signal. (a) True (b) False
  6. 6.Which of these is an output? (a) a motion sensor (b) a servo motor (c) a push button (d) a light sensor
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  8. 8.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  9. 9.💡 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) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a push button (d) a small display
  11. 11.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a small display (d) an LED
  12. 12.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
  13. 13.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 5 V (d) 50 V
  14. 14.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
  15. 15.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  16. 16.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  17. 17.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.True or false: “a tilt switch: on or off” is a digital signal. (a) False (b) True
  19. 19.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  20. 20.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  21. 21.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a battery (d) a resistor
  22. 22.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a sound sensor (d) a turning knob
  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 HIGH
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  26. 26.📶 Digital or analog: many values in a range? (a) digital (b) analog
  27. 27.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  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 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  31. 31.Which of these is an output? (a) a keypad (b) a push button (c) a light sensor (d) a buzzer
  32. 32.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  33. 33.Which of these is an input? (a) an LED (b) a motor (c) a temperature sensor (d) a water pump
  34. 34.💡 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 LOW
    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 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 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 LOW
    set pin 7 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 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  39. 39.Which of these is an input? (a) a turning knob (b) a small display (c) an LED (d) a servo motor
  40. 40.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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