from machine import Pin, PWM
import time, utime

trigger = Pin(20, Pin.OUT)
echo = Pin(21, Pin.IN)
# Buzzer configuration
buzzer_pin = Pin(6)  # Change this to the appropriate GPIO pin (GP6 on Raspberry Pi Pico)
buzzer_pwm = PWM(buzzer_pin)

def ultra():
    trigger.low()
    utime.sleep_us(10)
    trigger.high()
    utime.sleep_us(10)
    trigger.low()

    while echo.value() == 0:
        signaloff = utime.ticks_us()
    while echo.value() == 1:
        signalon = utime.ticks_us()

    timepassed = signalon - signaloff
    distance = round((timepassed * 0.0343) / 2, 0)
    return distance


def play_tone(frequency, duration):
    # Set the frequency of the PWM to the desired tone
    buzzer_pwm.freq(frequency)
    # Start the PWM
    buzzer_pwm.duty_u16(32767)  # 50% duty cycle
    # Wait for the specified duration
    time.sleep_ms(duration)
    # Stop the PWM
    buzzer_pwm.duty_u16(0)

# Play a simple melody with a frequency
melody = 200
#duration = 200  # in milliseconds
#uss = [10,11,12,20,30,35,20,70,56,49,23,70,60]
#x=40

while True:
    
    x = ultra()
    
    if (50>x>0):
        for i in range(3):
            play_tone(melody, 50)
            time.sleep_ms(200)  # Add a short delay between tones
        
    elif (100>x>49):
        for i in range(3):
            play_tone(melody, 50)
            time.sleep_ms(600)  # Add a short delay between tones

    elif (150>x>99):
        for i in range(3):
            play_tone(melody, 50)
            time.sleep_ms(1200)  # Add a short delay between tones

    else:
        pass