import machine
import time

# Define GPIO pins
GPIO_PIN_1 = 1
GPIO_PIN_2 = 2
GPIO_PIN_3 = 3

# Setup GPIO pins as outputs
def setup_gpio():
    # Configure GPIO pins 1, 2, and 3 as outputs
    machine.Pin(GPIO_PIN_1, machine.Pin.OUT)
    machine.Pin(GPIO_PIN_2, machine.Pin.OUT)
    machine.Pin(GPIO_PIN_3, machine.Pin.OUT)

# Function to toggle LEDs in a blinking loop
def led_blinking_loop():
    while True:
        # Turn on GPIO pin 1 (GPIO_PIN_1)
        machine.Pin(GPIO_PIN_1, machine.Pin.OUT).on()
        time.sleep(1)  # Delay for 1 second
        
        # Turn on GPIO pin 2 (GPIO_PIN_2)
        machine.Pin(GPIO_PIN_2, machine.Pin.OUT).on()
        time.sleep(1)  # Delay for 1 second
        
        # Turn on GPIO pin 3 (GPIO_PIN_3)
        machine.Pin(GPIO_PIN_3, machine.Pin.OUT).on()
        time.sleep(1)  # Delay for 1 second
        
        # Turn off GPIO pin 1 (GPIO_PIN_1)
        machine.Pin(GPIO_PIN_1, machine.Pin.OUT).off()
        time.sleep(1)  # Delay for 1 second
        
        # Turn off GPIO pin 2 (GPIO_PIN_2)
        machine.Pin(GPIO_PIN_2, machine.Pin.OUT).off()
        time.sleep(1)  # Delay for 1 second
        
        # Turn off GPIO pin 3 (GPIO_PIN_3)
        machine.Pin(GPIO_PIN_3, machine.Pin.OUT).off()
        time.sleep(1)  # Delay for 1 second

# Main function to run the program
def main():
    setup_gpio()  # Initialize GPIO pins
    led_blinking_loop()  # Start the LED blinking loop

# Execute the main function
if __name__ == "__main__":
    main()