import machine
import utime
from dht import DHT22
from machine import Pin, PWM

# Initialize DHT22 sensor
dht = DHT22(Pin(0))  # Assuming DHT22 is connected to GPIO0

# Initialize Servo motor
servo_pin = Pin(1)  # Assuming servo control is on GPIO1
servo = PWM(servo_pin, freq=50)  # Initialize PWM frequency (50 Hz)

# Initialize PIR sensor
pir_pin = Pin(2, Pin.IN)  # Assuming PIR sensor output is on GPIO2

# Variables to store initial DHT22 readings
initial_temp = 0
initial_humidity = 0

# Function to read DHT22 sensor data
def read_dht22():
    dht.measure()
    temp_c = dht.temperature()
    humidity = dht.humidity()
    return temp_c, humidity

# Function to control servo motor
def move_servo(angle):
    duty = int((angle / 180) * 1023)  # Convert angle to duty cycle (0-1023)
    servo.duty(duty)
    utime.sleep_ms(500)  # Wait for servo to reach position

# Initialize initial DHT22 readings
initial_temp, initial_humidity = read_dht22()

# Main loop
while True:
    # Read PIR sensor for motion detection
    motion_detected = pir_pin.value()
    
    # Read current DHT22 sensor data
    current_temp, current_humidity = read_dht22()
    
    # Check if there's a significant change in temperature or humidity
    temp_diff = abs(current_temp - initial_temp)
    humidity_diff = abs(current_humidity - initial_humidity)
    
    if motion_detected and (temp_diff >= 1 or humidity_diff >= 1):
        print("Motion detected and DHT22 variation detected!")
        move_servo(90)  # Move servo motor to 90 degrees
        
        # Update initial DHT22 readings
        initial_temp, initial_humidity = current_temp, current_humidity
    
    utime.sleep(1)  # Adjust sleep time as needed