from machine import Pin
import time

# Define GPIO pins
float_switch = Pin(18, Pin.IN, Pin.PULL_UP)  # Float switch connected to GPIO18
led = Pin(15, Pin.OUT)  # LED connected to GPIO15

def check_float_switch():
    """Checks the state of the float switch and controls the LED."""
    if float_switch.value() == 0:  # Float switch closed (liquid level detected)
        led.value(1)  # Turn LED ON
    else:  # Float switch open (no liquid level detected)
        print("Float switch is OPEN: No liquid level detected")
        led.value(0)  # Turn LED OFF

def main():
    """Main function to continuously monitor the float switch."""
    print("Starting float switch monitoring...")
    while True:
        check_float_switch()  # Continuously monitor the float switch
        time.sleep(2)  # Delay for stability and readability

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