print("Developed by: HANNAN")
print("Date: 22/4/2025")

#Import library/module
from machine import Pin, ADC, PWM, SoftI2C
import dht
import oled
import door_sensor
from time import sleep

#Pin Declaration
dht_sensor = dht.DHT22(Pin(26))
mq2_sensor = ADC(Pin(34))  
mq2_sensor.atten(ADC.ATTN_11DB)  # 0–3.3V range
red_led = Pin(19, Pin.OUT)
blue_led = Pin(17, Pin.OUT)
white_led = Pin(15, Pin.OUT)
buzzer = PWM(Pin(16))
i2c = SoftI2C(scl=Pin(22), sda=Pin(21))
servo_pin = 18
button_open = Pin(4, Pin.IN, Pin.PULL_UP)
button_close = Pin(5, Pin.IN, Pin.PULL_UP)

#object Declaration
screen = oled.SSD1306_I2C(width=128, height=64, i2c=i2c)
servo = PWM(Pin (servo_pin), freq=50)
servo = PWM(Pin(18), freq=50)
door_sensor_pin = 4      
servo_close = 0      
servo_open= 90 
door_sensor = Pin(door_sensor_pin, Pin.IN, Pin.PULL_UP)

def set_servo_angle(angle):
    duty = int((angle / 180) * 102 + 26)
    servo.duty(duty)

#Parameter Declaration 
set_servo_angle(servo_close)

#Main Program
while True:
    # Read DHT22 sensor
    dht_sensor.measure()
    temperature = dht_sensor.temperature()
    humidity = dht_sensor.humidity()

    # Read MQ2 sensor and convert to voltage
    gas_value = mq2_sensor.read()
    voltage = gas_value / 4095 * 3.3

    # Print to console
    print("Temp: {:.1f}C, Humidity: {:.1f}%, Gas: {:.2f}V".format(temperature, humidity, voltage))

    # OLED display
    screen.fill(0)
    screen.text("Temp: {:.1f}C".format(temperature), 0, 0, 1)
    screen.text("Humidity: {:.1f}%".format(humidity), 0, 10, 1)
    screen.text("Gas: {:.2f}V".format(voltage), 0, 20, 1)

    # Temperature alert
    if temperature >= 30:
        screen.text("ITS DANGEROUS ", 0, 35, 1)
        red_led.on()
        buzzer.init(freq=5000, duty=1023)
    else:
        red_led.off()
        

    # Humidity alert
    if humidity >= 70: 
        screen.text("VERY UNSAFE", 0, 45, 1)
        blue_led.on()
        buzzer.init(freq=800, duty=512)
    else:
        blue_led.off()
        white_led.off()
    
    # Gas alert
    if voltage >= 1.5:
        screen.text("⚠ Gas Detected!!", 0, 45, 1)
        white_led.on()
        buzzer.init(freq=1000, duty=512)

    elif temperature < 30 and humidity < 70 and voltage < 1.5:
        #screen.text("ALL GOOD", 0, 45, 1)
        #buzzer.init(freq=800, duty=0)
        
    #servo motor
     if button_open.value() == 1:
        set_servo_angle(90)
        red_led.on()
        blue_led.on()
        white_led.on()
        buzzer.init(freq=1000, duty=512)
        screen.fill(0)
        screen.text("CLOSE THE DOOR!", 0, 45,1)
        screen.show()
        sleep(0.5)

    elif button_close.value() == 0:
        set_servo_angle(0)
        red_led.off()
        blue_led.off()
        white_led.off()
        buzzer.init(freq=800, duty=0)
        screen.fill(0)
        screen.text("DOOR CLOSE", 0, 45,1)
        screen.show()
        sleep(0.5)
       
    sleep(0.2)
    screen.show()
    sleep(5)