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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 643 · 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 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    set pin 8 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 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  3. 3.💡 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
  4. 4.💡 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 7 LOW
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  6. 6.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  7. 7.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  8. 8.Which of these is an output? (a) a temperature sensor (b) a keypad (c) a turning knob (d) a speaker
  9. 9.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  10. 10.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 1.5 V (d) 9 V
  11. 11.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  12. 12.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  13. 13.True or false: “how loud a sound is” is an analog signal. (a) False (b) True
  14. 14.Which of these is an input? (a) a sound sensor (b) a servo motor (c) an LED (d) a small display
  15. 15.Which of these is an output? (a) a sound sensor (b) a push button (c) a temperature sensor (d) a small display
  16. 16.📶 How many states can a digital pin have? (a) two (b) one (c) a thousand (d) ten
  17. 17.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  18. 18.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
  19. 19.Which of these is an input? (a) a small display (b) a light sensor (c) a buzzer (d) a motor
  20. 20.🔍 Which is the odd one out? (a) an LED (b) a motion sensor (c) a temperature sensor (d) a sound sensor
  21. 21.Which of these is an output? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a water pump
  22. 22.Which of these is an output? (a) a turning knob (b) a light sensor (c) a sound sensor (d) a buzzer
  23. 23.🔍 Which is the odd one out? (a) a turning knob (b) a light sensor (c) a motion sensor (d) a water pump
  24. 24.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  25. 25.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a water pump (d) a motion sensor
  26. 26.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
  27. 27.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  28. 28.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a small display (d) a push button
  29. 29.Which of these is an input? (a) a servo motor (b) a speaker (c) a push button (d) an LED
  30. 30.📶 A pin that reads a push button is set as … (a) an input (b) a resistor (c) a battery (d) an output
  31. 31.💡 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
    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
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  34. 34.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  35. 35.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  36. 36.True or false: “a door: open or shut” is an analog signal. (a) True (b) False
  37. 37.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  38. 38.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
  39. 39.💡 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 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital

Answer key

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

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