import machine
import dht
import time
from machine import Pin, ADC, I2C
import ssd1306

# --- Configuration ---
# I2C for OLED (128x64)
i2c = I2C(0, scl=Pin(22), sda=Pin(21))
oled = ssd1306.SSD1306_I2C(128, 64, i2c)
oled.invert(1)

# Sensors
dht_sensor = dht.DHT22(Pin(15))
gas_sensor = ADC(Pin(35))
pot = ADC(Pin(34))

# Outputs
relay = Pin(18, Pin.OUT)
buzzer = Pin(19, Pin.OUT)
led = Pin(5, Pin.OUT)

# ADC Setup (Read 0-3.3V)
gas_sensor.atten(ADC.ATTN_11DB)
pot.atten(ADC.ATTN_11DB)

def update_display(temp, hum, gas, pot):
    oled.fill(0)
    oled.text("Env Monitor", 0, 0)
    oled.text("Temp : {} C".format(temp), 0, 16)
    oled.text("Hum  : {} %".format(hum), 0, 24)
    oled.text("Gas  : {}".format(gas), 0, 32)
    oled.text("Pot  : {}".format(pot), 0, 40)
    oled.show()

while True:
    try:
        try:
            # Read DHT22
            dht_sensor.measure()
            t = dht_sensor.temperature()
            h = dht_sensor.humidity()
            
            # Read Analog sensors
            gas_val = gas_sensor.read()
            pot_val = pot.read()
            
            # Logic: If gas is high or temp > 30C, trigger alarm
            if gas_val > 2000 or t > 30:
                relay.value(1)
                buzzer.value(1)
                led.value(1)
            else:
                relay.value(0)
                buzzer.value(0)
                led.value(0)
                
            update_display(t, h, gas_val, pot_val)    
            
        except OSError as e:
            print("Failed to read sensor.")

        time.sleep(2)
    except KeyboardInterrupt as e:
        print("Klavye kesmesiyle çıkış yapıldı.")