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

# Pins
dht_pin = Pin(15)
ldr = ADC(26)
led = Pin(16, Pin.OUT)
servo = PWM(Pin(17))
servo.freq(50)

# Thresholds
TEMP_LIMIT = 30
LDR_THRESHOLD = 30000

# servo helper
def set_angle(angle):
    min_u16 = int(0.025 * 65535)
    max_u16 = int(0.125 * 65535)
    duty = int(min_u16 + (angle / 180.0) * (max_u16 - min_u16))
    servo.duty_u16(duty)

sensor = dht.DHT11(dht_pin)
last_print = time.ticks_ms()

while True:
    # Read sensors (DHT slow; measure each loop but it's fine)
    try:
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()
    except Exception:
        temp = None
        hum = None

    light_value = ldr.read_u16()

    # Light indicator
    led.value(1 if light_value < LDR_THRESHOLD else 0)

    # Vent control
    if temp is not None and temp > TEMP_LIMIT:
        set_angle(90)   # open vent: choose angle that matches "open"
    else:
        set_angle(0)    # closed

    # Periodic console output every 5 seconds
    if time.ticks_diff(time.ticks_ms(), last_print) > 5000:
        print("Temp:", temp, "Humidity:", hum, "Light:", light_value)
        last_print = time.ticks_ms()

    time.sleep(0.2)