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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 259 · 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.🔍 Which is the odd one out? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a buzzer
  2. 2.🔌 Is a water pump an input or an output for a microcontroller? (a) input (b) output
  3. 3.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  4. 4.💡 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 8 HIGH
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  5. 5.📶 Digital or analog: many values in a range? (a) analog (b) digital
  6. 6.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  7. 7.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  8. 8.Which of these is an input? (a) a buzzer (b) a servo motor (c) a water pump (d) a light sensor
  9. 9.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  10. 10.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
  11. 11.📶 A pin that reads a push button is set as … (a) an input (b) a battery (c) an output (d) a resistor
  12. 12.📶 A pin set LOW gives about … (a) 1.5 V (b) 5 V (c) 9 V (d) 0 V
  13. 13.💡 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 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  15. 15.🔍 Which is the odd one out? (a) a push button (b) a speaker (c) a buzzer (d) a motor
  16. 16.Which of these is an input? (a) an LED (b) a sound sensor (c) a small display (d) a motor
  17. 17.🔍 Which is the odd one out? (a) a servo motor (b) a water pump (c) an LED (d) a light sensor
  18. 18.📶 Digital or analog: the room temperature? (a) analog (b) digital
  19. 19.🔌 Is a small display an input or an output for a microcontroller? (a) output (b) input
  20. 20.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  21. 21.True or false: “a knob turned part way” is a digital signal. (a) False (b) True
  22. 22.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  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 LOW
    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
  24. 24.True or false: “many values in a range” is a digital signal. (a) False (b) True
  25. 25.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  26. 26.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
  27. 27.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  28. 28.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  29. 29.Which of these is an input? (a) a small display (b) a temperature sensor (c) a speaker (d) a servo motor
  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 8 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  31. 31.Which of these is an output? (a) a push button (b) a servo motor (c) a light sensor (d) a turning knob
  32. 32.Which of these is an input? (a) a motion sensor (b) an LED (c) a buzzer (d) a speaker
  33. 33.Which of these is an output? (a) a push button (b) a keypad (c) a light sensor (d) a speaker
  34. 34.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  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 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  36. 36.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
  37. 37.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 50 V (d) 5 V
  38. 38.💡 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) ON (b) OFF
  39. 39.💡 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
  40. 40.Which of these is an output? (a) an LED (b) a light sensor (c) a push button (d) a sound sensor

Answer key

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

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