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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 870 · 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 7 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  2. 2.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
  3. 3.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  4. 4.📶 A pin set LOW gives about … (a) 1.5 V (b) 0 V (c) 5 V (d) 9 V
  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 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  6. 6.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 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
  7. 7.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  8. 8.True or false: “many values in a range” is an analog signal. (a) True (b) False
  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 8 HIGH
    set pin 8 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  10. 10.Which of these is an output? (a) a light sensor (b) a servo motor (c) a push button (d) a keypad
  11. 11.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 0 V (c) 5 V (d) 230 V
  12. 12.🔍 Which is the odd one out? (a) a turning knob (b) a water pump (c) a temperature sensor (d) a push button
  13. 13.True or false: “a door: open or shut” is a digital signal. (a) False (b) True
  14. 14.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  15. 15.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  16. 16.True or false: “how bright a room is” is a digital signal. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) a keypad (b) a buzzer (c) a temperature sensor (d) a sound sensor
  18. 18.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  19. 19.💡 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) ON (b) OFF
  20. 20.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  21. 21.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a push button (d) an LED
  22. 22.🔍 Which is the odd one out? (a) a turning knob (b) a motor (c) a buzzer (d) a small display
  23. 23.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a temperature sensor (d) a small display
  24. 24.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  25. 25.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  26. 26.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  27. 27.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  28. 28.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  30. 30.💡 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 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.💡 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) ON (b) OFF
  32. 32.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  33. 33.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a temperature sensor (d) a motor
  35. 35.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “the room temperature” is an analog signal. (a) False (b) True
  37. 37.📶 Digital or analog: a door: open or shut? (a) digital (b) analog
  38. 38.🔍 Which is the odd one out? (a) a small display (b) a water pump (c) an LED (d) a sound sensor
  39. 39.💡 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 8 LOW
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.Which of these is an input? (a) a temperature sensor (b) an LED (c) a servo motor (d) a water pump

Answer key

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

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