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Electronics Worksheet: Input and Output Pins

Electronics lesson 22: Input and output pins · Set 124 · 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 speaker (b) a water pump (c) a small display (d) a light sensor
  2. 2.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
  3. 3.💡 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 LOW
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  4. 4.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    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
  5. 5.Which of these is an input? (a) a motor (b) an LED (c) a small display (d) a keypad
  6. 6.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  7. 7.💡 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) ON (b) OFF
  8. 8.📶 A pin set LOW gives about … (a) 5 V (b) 0 V (c) 1.5 V (d) 9 V
  9. 9.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  10. 10.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
  11. 11.💡 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
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  12. 12.🔍 Which is the odd one out? (a) an LED (b) a turning knob (c) a buzzer (d) a water pump
  13. 13.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
  14. 14.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
  15. 15.Which of these is an input? (a) a speaker (b) a motor (c) a temperature sensor (d) a servo motor
  16. 16.True or false: “a button: pressed or not” is a digital signal. (a) False (b) True
  17. 17.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a buzzer (d) a turning knob
  18. 18.True or false: “a door: open or shut” is a digital signal. (a) True (b) False
  19. 19.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    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
  20. 20.True or false: “HIGH or LOW only” is an analog signal. (a) True (b) False
  21. 21.💡 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 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  22. 22.💡 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
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  23. 23.Which of these is an output? (a) a sound sensor (b) a push button (c) a light sensor (d) a motor
  24. 24.💡 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
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  25. 25.🔍 Which is the odd one out? (a) a servo motor (b) a buzzer (c) a sound sensor (d) an LED
  26. 26.Which of these is an output? (a) a turning knob (b) a motion sensor (c) a servo motor (d) a light sensor
  27. 27.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
  28. 28.Which of these is an input? (a) a servo motor (b) a light sensor (c) a water pump (d) a buzzer
  29. 29.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
  30. 30.🔌 Is a speaker an input or an output for a microcontroller? (a) output (b) input
  31. 31.Which of these is an output? (a) a light sensor (b) a push button (c) a turning knob (d) an LED
  32. 32.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
  33. 33.🔌 Is a light sensor an input or an output for a microcontroller? (a) output (b) input
  34. 34.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  35. 35.💡 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 7 HIGH
    Is the LED ON or OFF at the end?     (a) ON (b) OFF
  36. 36.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
  37. 37.True or false: “a tilt switch: on or off” is an analog signal. (a) False (b) True
  38. 38.🔌 Is a turning knob an input or an output for a microcontroller? (a) input (b) output
  39. 39.📶 Digital or analog: a knob turned part way? (a) analog (b) digital
  40. 40.📶 Digital or analog: the room temperature? (a) analog (b) digital

Answer key

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

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