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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 658 · 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.💡 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) OFF (b) ON
  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 7 LOW
    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
  3. 3.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  4. 4.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
  5. 5.🔍 Which is the odd one out? (a) a motor (b) a light sensor (c) a water pump (d) a small display
  6. 6.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  7. 7.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  8. 8.🔍 Which is the odd one out? (a) a speaker (b) a motor (c) a turning knob (d) a buzzer
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 230 V (c) 0 V (d) 5 V
  10. 10.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  11. 11.Which of these is an output? (a) a light sensor (b) a servo motor (c) a motion sensor (d) a keypad
  12. 12.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “how bright a room is” is an analog signal. (a) True (b) False
  14. 14.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  15. 15.Which of these is an input? (a) a light sensor (b) a buzzer (c) a small display (d) a speaker
  16. 16.True or false: “many values in a range” is an analog signal. (a) True (b) False
  17. 17.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  18. 18.💡 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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.Which of these is an input? (a) a speaker (b) a small display (c) a water pump (d) a push button
  20. 20.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  21. 21.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  22. 22.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.🔍 Which is the odd one out? (a) a speaker (b) a servo motor (c) a water pump (d) a motion sensor
  25. 25.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  26. 26.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
  28. 28.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  29. 29.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  30. 30.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 Digital or analog: many values in a range? (a) digital (b) analog
  32. 32.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  33. 33.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  34. 34.📶 Digital or analog: a door: open or shut? (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 7 LOW
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  37. 37.💡 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 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  39. 39.📶 Digital or analog: the room temperature? (a) digital (b) analog
  40. 40.True or false: “many values in a range” is a digital signal. (a) True (b) False

Answer key

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

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