from machine import Pin, PWM
from utime import sleep
import dht

# Pin definitions
PIN_TEMPERATURE_SENSOR = 15
PIN_SERVO = 16

# Create sensor object
sensor = dht.DHT22(Pin(PIN_TEMPERATURE_SENSOR))

# Create servo object
servo = PWM(Pin(PIN_SERVO))
servo.freq(50)

# Helper function to move servo
def set_servo_position(duty_value):
    servo.duty(duty_value)

while True:
    try:
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()

        print("Temperature:", temp, "C")
        print("Humidity:", hum, "%")

        # Smart ventilation logic
        if temp < 22:
            set_servo_position(26)   # nearly closed
            print("Room is cool -> Vent closed")

        elif temp < 26:
            set_servo_position(50)   # slightly open
            print("Room is comfortable -> Vent slightly open")

        elif temp < 30:
            set_servo_position(75)   # half open
            print("Room is warm -> Vent half open")

        elif temp < 34:
            set_servo_position(100)  # mostly open
            print("Room is hot -> Vent mostly open")

        else:
            set_servo_position(123)  # fully open
            print("Room is very hot -> Vent fully open")

        print("------------------------")
        sleep(2)

    except OSError:
        print("Failed to read from DHT22 sensor")
        sleep(2)