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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 989 · 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.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  2. 2.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) a resistor (d) an output
  3. 3.True or false: “the room temperature” is a digital signal. (a) True (b) False
  4. 4.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  5. 5.💡 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
  6. 6.True or false: “a button: pressed or not” is a digital signal. (a) True (b) False
  7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 0 V (c) 230 V (d) 50 V
  8. 8.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  9. 9.Which of these is an output? (a) a sound sensor (b) a motor (c) a turning knob (d) a keypad
  10. 10.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
  11. 11.Which of these is an output? (a) a temperature sensor (b) a light sensor (c) a small display (d) a push button
  12. 12.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) output (b) input
  13. 13.💡 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
  14. 14.💡 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) ON (b) OFF
  15. 15.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  16. 16.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  17. 17.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.🔍 Which is the odd one out? (a) a sound sensor (b) a motor (c) a motion sensor (d) a keypad
  19. 19.🔍 Which is the odd one out? (a) a motion sensor (b) a servo motor (c) a motor (d) a water pump
  20. 20.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a temperature sensor (d) a turning knob
  21. 21.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  22. 22.🔍 Which is the odd one out? (a) a keypad (b) a servo motor (c) a push button (d) a light sensor
  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 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  24. 24.🔍 Which is the odd one out? (a) a buzzer (b) a speaker (c) a keypad (d) a water pump
  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 8 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.Which of these is an input? (a) a motion sensor (b) a water pump (c) a speaker (d) a motor
  27. 27.📶 Digital or analog: many values in a range? (a) analog (b) digital
  28. 28.💡 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
  29. 29.💡 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) ON (b) OFF
  30. 30.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.📶 A pin set LOW gives about … (a) 1.5 V (b) 9 V (c) 0 V (d) 5 V
  32. 32.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
  33. 33.💡 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 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  34. 34.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  35. 35.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  37. 37.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  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 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  40. 40.💡 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
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON

Answer key

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

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