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

# --- Initialize ---
sensor = dht.DHT22(Pin(16))  # Use DHT22
ldr = ADC(26)
servo = PWM(Pin(15))
led = Pin(14, Pin.OUT)
servo.freq(50)

def set_angle(angle):
    min_duty = 1638   # 0.5ms
    max_duty = 8192   # 2.5ms
    duty = int(min_duty + (angle / 180) * (max_duty - min_duty))
    servo.duty_u16(duty)

while True:
    # --- Read DHT22 safely ---
    try:
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()
    except OSError:
        temp = None
        hum = None
        print("DHT22 read error")
    
    # --- Read LDR ---
    light = ldr.read_u16()
    
    # --- Servo Control ---
    if temp is not None:
        if temp > 30:
            set_angle(90)
            print("Vent Open - High Temp")
        else:
            set_angle(0)
            print("Vent Closed - Temp Normal")
    
    # --- LED Control ---
    if light < 30000:
        led.value(1)
        print("LED ON - Low Light")
    else:
        led.value(0)
        print("LED OFF - Bright Light")
    
    print(f"Temp: {temp}, Humidity: {hum}, Light: {light}")
    print("-----------------------------")
    time.sleep(5)