import time
import machine
import dht
from machine import Pin, PWM

# Set up the temperature sensor
d = dht.DHT11(machine.Pin(4))

# Set up the ultrasonic sensor
trig = Pin(17, Pin.OUT)
echo = Pin(16, Pin.IN)

# Set up the buzzer
buzzer_pin = machine.Pin(2)
buzzer = PWM(buzzer_pin, freq=2000)

# Define the temperature range
min_temp = 20
max_temp = 30

# Define the buzzer volume range
min_distance = 30
max_distance = 100

def get_temperature():
  d.measure()
  return d.temperature()

def get_distance():
    trig.low()
    time.sleep_us(2)
    trig.high()
    time.sleep_us(10)
    trig.low()
    duration = machine.time_pulse_us(echo, 1)
    distance = duration / 58
    return distance

def map_range(value, low1, high1, low2, high2):
    return low2 + (high2 - low2) * (value - low1) / (high1 - low1)

while True:
    # Read the temperature
    temp = get_temperature()

    # Check if the temperature is outside the desired range
    if temp < min_temp or temp > max_temp:
        # Set the buzzer volume based on the distance to the nearest obstacle
        distance = get_distance(10)
        volume = map_range(distance, min_distance, max_distance, 0, 65535)
        buzzer.duty(int(volume))

        # Trigger the buzzer
        buzzer.freq(1000)
        time.sleep(1)
        buzzer.freq(0)
        time.sleep(1)
    else:
        # Turn off the buzzer
        buzzer.duty(0)

    time.sleep(1)