Raspberry Pi GPIO: Blinking LEDs

Python Code:

Now, let’s write the Python code to control these LEDs. You can use the RPi.GPIO library to interact with the GPIO pins.

import RPi.GPIO as GPIO
import time

# Set the GPIO mode to BCM
GPIO.setmode(GPIO.BCM)

# Define the GPIO pins for the LEDs
led1_pin = 11
led2_pin = 18

# Setup the GPIO pins
GPIO.setup(led1_pin, GPIO.OUT)
GPIO.setup(led2_pin, GPIO.OUT)

try:
    while True:
        # Turn on LED 1
        GPIO.output(led1_pin, GPIO.HIGH)
        time.sleep(1)
        
        # Turn off LED 1 and turn on LED 2
        GPIO.output(led1_pin, GPIO.LOW)
        GPIO.output(led2_pin, GPIO.HIGH)
        time.sleep(1)
        
        # Turn off LED 2
        GPIO.output(led2_pin, GPIO.LOW)
        time.sleep(1)

except KeyboardInterrupt:
    # Clean up when the program is interrupted
    GPIO.cleanup()

Explanation:

• Import the RPi.GPIO library and set the GPIO mode to BCM.
• Define the GPIO pins used for the LEDs.
• Set up the GPIO pins as output.
• Create a loop that alternates between turning on LED 1, LED 2, and turning both off.