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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 573 · 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 water pump (b) a servo motor (c) a temperature sensor (d) a buzzer
  2. 2.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a turning knob (d) a keypad
  3. 3.📶 Digital or analog: many values in a range? (a) analog (b) digital
  4. 4.💡 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
  5. 5.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
  6. 6.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
  7. 7.Which of these is an output? (a) a motion sensor (b) a turning knob (c) a small display (d) a temperature sensor
  8. 8.📶 Digital or analog: the room temperature? (a) digital (b) analog
  9. 9.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  10. 10.True or false: “many values in a range” is an analog signal. (a) True (b) False
  11. 11.💡 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
  12. 12.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  13. 13.💡 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 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  14. 14.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 50 V (c) 0 V (d) 5 V
  15. 15.Which of these is an output? (a) a speaker (b) a push button (c) a temperature sensor (d) a motion sensor
  16. 16.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  17. 17.💡 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 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  18. 18.📶 How many states can a digital pin have? (a) one (b) a thousand (c) ten (d) two
  19. 19.🔍 Which is the odd one out? (a) a light sensor (b) a buzzer (c) a motion sensor (d) a push button
  20. 20.True or false: “a button: pressed or not” is an analog signal. (a) True (b) False
  21. 21.🔍 Which is the odd one out? (a) a buzzer (b) a turning knob (c) a motor (d) a water pump
  22. 22.Which of these is an output? (a) a sound sensor (b) a keypad (c) a light sensor (d) a motor
  23. 23.💡 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 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  25. 25.💡 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
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  26. 26.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  27. 27.Which of these is an input? (a) a speaker (b) a water pump (c) a servo motor (d) a push button
  28. 28.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
  29. 29.🔍 Which is the odd one out? (a) a push button (b) a water pump (c) a light sensor (d) a keypad
  30. 30.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.Which of these is an input? (a) a keypad (b) a motor (c) a small display (d) a speaker
  32. 32.💡 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 HIGH
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  33. 33.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  34. 34.📶 Digital or analog: how bright a room is? (a) digital (b) analog
  35. 35.🔌 Is an LED an input or an output for a microcontroller? (a) input (b) output
  36. 36.📶 Digital or analog: HIGH or LOW only? (a) digital (b) analog
  37. 37.💡 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) ON (b) OFF
  38. 38.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  39. 39.📶 A pin that reads a push button is set as … (a) an output (b) a resistor (c) an input (d) a battery
  40. 40.Which of these is an output? (a) a temperature sensor (b) a sound sensor (c) an LED (d) a turning knob

Answer key

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

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