LED class and methods in Raspberry Pi - Mini Project: Build & Apply

LED class and methods

📖 Scenario: You have a Raspberry Pi connected to an LED light. You want to control the LED by turning it on and off using a simple program.

🎯 Goal: Create a class called LED that can turn the LED on and off using methods. Then, use this class to turn the LED on and off.

📋 What You'll Learn

Create a class named LED

Add an __init__ method that takes a pin number and stores it

Add a method turn_on that prints "LED on pin X is ON" where X is the pin number

Add a method turn_off that prints "LED on pin X is OFF" where X is the pin number

Create an instance of LED with pin number 17

Call turn_on and turn_off methods on the instance

💡 Why This Matters

🌍 Real World

Controlling hardware like LEDs on a Raspberry Pi is common in home automation and robotics projects.

💼 Career

Understanding how to create classes and methods to control hardware devices is useful for embedded systems and IoT developer roles.

1

Create the LED class with an __init__ method

Create a class called LED with an __init__ method that takes a parameter pin and stores it in self.pin.

Raspberry Pi

# Your code here

Need a hint?

Remember, the __init__ method sets up the object with the pin number.

2

Add methods to turn the LED on and off

Add a method turn_on that prints "LED on pin {self.pin} is ON" and a method turn_off that prints "LED on pin {self.pin} is OFF" inside the LED class.

Raspberry Pi

class LED:
    def __init__(self, pin):
        self.pin = pin

# Your code here

Need a hint?

Use print(f"LED on pin {self.pin} is ON") inside turn_on and similar for turn_off.

3

Create an LED instance with pin 17

Create an instance of the LED class named led with the pin number 17.

Raspberry Pi

class LED:
    def __init__(self, pin):
        self.pin = pin

    def turn_on(self):
        print(f"LED on pin {self.pin} is ON")

    def turn_off(self):
        print(f"LED on pin {self.pin} is OFF")

# Your code here

Need a hint?

Use led = LED(17) to create the LED object.

4

Turn the LED on and off using the methods

Call the turn_on method on led to turn the LED on, then call the turn_off method on led to turn the LED off. Print the output.

Raspberry Pi

class LED:
    def __init__(self, pin):
        self.pin = pin

    def turn_on(self):
        print(f"LED on pin {self.pin} is ON")

    def turn_off(self):
        print(f"LED on pin {self.pin} is OFF")

led = LED(17)

# Your code here

Need a hint?

Use led.turn_on() and led.turn_off() to show the LED status.