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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 134 · 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.True or false: “many values in a range” is an analog signal. (a) True (b) False
  2. 2.💡 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 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.💡 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 8 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  6. 6.🔍 Which is the odd one out? (a) a small display (b) a servo motor (c) a motor (d) a keypad
  7. 7.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  8. 8.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.💡 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
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  11. 11.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  12. 12.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  13. 13.📶 Digital or analog: the room temperature? (a) digital (b) analog
  14. 14.💡 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
  15. 15.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  16. 16.Which of these is an input? (a) a buzzer (b) a push button (c) an LED (d) a speaker
  17. 17.💡 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 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a turning knob (d) a keypad
  19. 19.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  20. 20.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  21. 21.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  22. 22.🔍 Which is the odd one out? (a) a water pump (b) a small display (c) a push button (d) a motor
  23. 23.💡 An LED (with its resistor) is on pin 7. 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
  24. 24.Which of these is an output? (a) a motion sensor (b) a push button (c) a buzzer (d) a light sensor
  25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a small display (c) a keypad (d) a motion sensor
  26. 26.🔍 Which is the odd one out? (a) a light sensor (b) a push button (c) a turning knob (d) a speaker
  27. 27.📶 How many states can a digital pin have? (a) one (b) a thousand (c) two (d) ten
  28. 28.💡 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 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  29. 29.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  30. 30.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a push button (d) a sound sensor
  31. 31.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  32. 32.🔍 Which is the odd one out? (a) a buzzer (b) a sound sensor (c) a push button (d) a keypad
  33. 33.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  34. 34.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  35. 35.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  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 7 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.True or false: “many values in a range” is a digital signal. (a) True (b) False
  38. 38.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
  39. 39.True or false: “the room temperature” is an analog signal. (a) True (b) False
  40. 40.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF

Answer key

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

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