from machine import Pin, I2C
import dht
import time
from pico_i2c_lcd import I2cLcd

# ---- Setup ----
sensor = dht.DHT22(Pin(15))

i2c = I2C(0, sda=Pin(4), scl=Pin(5), freq=400000)
lcd = I2cLcd(i2c, 0x27, 2, 16)   # try 0x3F if 0x27 doesn't show text

fan = Pin(16, Pin.OUT)

TEMP_THRESHOLD = 40.0   # °C - fan turns ON above this
HUM_THRESHOLD  = 60.0   # % RH - fan turns ON above this

lcd.clear()
lcd.putstr("Agarbatti Dryer\nInitializing...")
time.sleep(2)

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

        lcd.clear()
        lcd.putstr("T:{:.1f}C H:{:.1f}%".format(temp, hum))

        if temp > TEMP_THRESHOLD or hum > HUM_THRESHOLD:
            fan.value(1)
            lcd.move_to(0, 1)
            lcd.putstr("Fan: ON")
        else:
            fan.value(0)
            lcd.move_to(0, 1)
            lcd.putstr("Fan: OFF")

    except OSError as e:
        lcd.clear()
        lcd.putstr("Sensor Error")
        print("DHT read error:", e)

    time.sleep(2)