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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 942 · 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 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  2. 2.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  3. 3.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a speaker (d) a buzzer
  4. 4.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  5. 5.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  6. 6.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an output (d) an input
  7. 7.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
  10. 10.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 9 V (d) 1.5 V
  11. 11.🔍 Which is the odd one out? (a) a push button (b) a sound sensor (c) a buzzer (d) a keypad
  12. 12.📶 Digital or analog: how bright a room is? (a) analog (b) digital
  13. 13.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  14. 14.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  15. 15.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  16. 16.💡 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) OFF (b) ON
  17. 17.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  18. 18.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  19. 19.📶 On a 5 V board, a pin set HIGH gives about … (a) 50 V (b) 5 V (c) 0 V (d) 230 V
  20. 20.Which of these is an input? (a) a buzzer (b) a motor (c) a speaker (d) a turning knob
  21. 21.True or false: “how bright a room is” is an analog signal. (a) False (b) True
  22. 22.True or false: “many values in a range” is an analog signal. (a) True (b) False
  23. 23.💡 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
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  24. 24.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.Which of these is an input? (a) a speaker (b) an LED (c) a keypad (d) a buzzer
  26. 26.Which of these is an input? (a) a buzzer (b) a push button (c) a servo motor (d) a water pump
  27. 27.💡 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 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  28. 28.🔍 Which is the odd one out? (a) a keypad (b) an LED (c) a water pump (d) a servo motor
  29. 29.🔍 Which is the odd one out? (a) a water pump (b) a servo motor (c) a sound sensor (d) a motor
  30. 30.📶 Digital or analog: many values in a range? (a) digital (b) analog
  31. 31.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  32. 32.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
  34. 34.Which of these is an output? (a) a water pump (b) a motion sensor (c) a light sensor (d) a keypad
  35. 35.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 7 HIGH
    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 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  38. 38.💡 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 LOW
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.💡 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
  40. 40.Which of these is an output? (a) a keypad (b) a servo motor (c) a turning knob (d) a temperature sensor

Answer key

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

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