print("Hello, Pi Pico W!")
from machine import Pin, time_pulse_us
import utime

# Set up the pins
trig = Pin(15, Pin.OUT)
echo = Pin(14, Pin.IN)
led = Pin(13, Pin.OUT)
buzzer = Pin(12, Pin.OUT)
switch = Pin(11, Pin.IN, Pin.PULL_DOWN)  # Sliding switch with pull-down resistor

def measure_distance():
    # Send a 10us pulse to trigger the sensor
    trig.low()
    utime.sleep_us(2)
    trig.high()
    utime.sleep_us(10)
    trig.low()
    
    # Measure the duration of the pulse on the echo pin
    duration = time_pulse_us(echo, 1)
    
    # Calculate distance in cm
    distance = (duration / 2) / 29.1
    return distance

while True:
    if switch.value() == 1:  # Sliding switch is on
        distance = measure_distance()
        print('Distance:', distance, 'cm')
        
        if distance < 250:
            # Blink LED and sound buzzer
            for _ in range(10):
                led.toggle()
                buzzer.value(1)
                utime.sleep(0.1)
                led.toggle()
                buzzer.value(0)
                utime.sleep(0.1)
        else:
            # Turn off LED and buzzer if distance >= 250
            led.value(0)
            buzzer.value(0)
    else:
        # Turn off LED and buzzer if switch is off
        led.value(0)
        buzzer.value(0)
    
    utime.sleep(0.1)  # Small delay to stabilize readings