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"""Smart Fire Detection System using ESP32 and IoT"""

from machine import Pin, PWM, SoftI2C
import time
import dht
import wifi
import ifttt
from lcd_api import LcdApi
from i2c_lcd import I2cLcd
import urequests as requests

# -------------------------------------------------
# Hardware Configuration
# -------------------------------------------------

# Red LED for fire warning indication
ledRed = Pin(13, Pin.OUT)

# DHT22 sensor for temperature and humidity monitoring
dht22_sensor = dht.DHT22(Pin(32, Pin.IN))

# Buzzers for fire alarm sound
buzzer1 = PWM(Pin(12))
buzzer2 = PWM(Pin(14))

# Configure buzzer frequencies
buzzer1.freq(1024)
buzzer2.freq(512)

# Turn buzzers OFF initially
buzzer1.duty(0)
buzzer2.duty(0)

# Make sure LED is OFF initially
ledRed.off()

# -------------------------------------------------
# LCD Configuration
# -------------------------------------------------

I2C_ADDR = 0x27
totalRows = 2
totalColumns = 16

# Initialize I2C communication for LCD
i2c = SoftI2C(scl=Pin(18), sda=Pin(19), freq=100000)

# Initialize LCD display
lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns)

# Display startup message
lcd.move_to(0, 0)
lcd.putstr("Smart Fire")

lcd.move_to(0, 1)
lcd.putstr("Detection Sys")

# -------------------------------------------------
# Connect ESP32 to WiFi
# -------------------------------------------------

wifi.connect_ap()

# -------------------------------------------------
# Main Fire Detection Function
# -------------------------------------------------

def fire_alarm():

    # Prevent sending multiple email alerts repeatedly
    mail_send_count = 0

    while True:

        # Wait 5 seconds between readings
        time.sleep(5)

        # Read temperature and humidity values
        dht22_sensor.measure()

        temperature = dht22_sensor.temperature()
        humidity = dht22_sensor.humidity()

        # -------------------------------------------------
        # Print readings to Serial Monitor
        # -------------------------------------------------

        print("=====================================")
        print(" SMART FIRE DETECTION SYSTEM ")
        print("=====================================")

        print("Room Temperature:", str(temperature) + " °C")
        print("Room Humidity   :", str(humidity) + " %")

        # -------------------------------------------------
        # Display readings on LCD
        # -------------------------------------------------

        lcd.clear()

        lcd.move_to(0, 0)
        lcd.putstr("Temp: {} C".format(temperature))

        lcd.move_to(0, 1)
        lcd.putstr("Hum : {} %".format(humidity))

        # -------------------------------------------------
        # Fire Detection Logic
        # -------------------------------------------------

        # If temperature exceeds 57°C,
        # activate the fire alarm system

        if temperature > 57:

            print(" ")
            print("!!! FIRE ALERT DETECTED !!!")
            print("High temperature detected!")
            print("Activating alarm system...")
            print(" ")

            # -------------------------------------------------
            # Turn ON LED continuously during fire alert
            # -------------------------------------------------

            ledRed.on()

            # -------------------------------------------------
            # Display warning on LCD
            # -------------------------------------------------

            lcd.clear()

            lcd.move_to(0, 0)
            lcd.putstr("!!! FIRE !!!")

            lcd.move_to(0, 1)
            lcd.putstr("HIGH TEMP!")

            # -------------------------------------------------
            # Alarm repetition counter
            # -------------------------------------------------

            alarm_count = 0

            while alarm_count < 3:

                # Activate first buzzer
                buzzer1.duty(50)

                time.sleep(0.4)

                # Turn OFF first buzzer
                buzzer1.duty(0)

                # Activate second buzzer
                buzzer2.duty(50)

                time.sleep(0.5)

                # Turn OFF second buzzer
                buzzer2.duty(0)

                alarm_count += 1

            # -------------------------------------------------
            # Send IoT Alert Notification
            # -------------------------------------------------

            if mail_send_count == 0:

                print("Sending emergency notification...")

                # Send notification through IFTTT
                ifttt.fire_alert(temperature)

                print("Notification sent successfully!")

                mail_send_count += 1

        else:

            # -------------------------------------------------
            # Safe condition
            # -------------------------------------------------

            print("System Status: SAFE")
            print("No fire detected.")
            print(" ")

            # -------------------------------------------------
            # Turn OFF LED when there is no fire
            # -------------------------------------------------

            ledRed.off()

            # -------------------------------------------------
            # Turn OFF alarm devices
            # -------------------------------------------------

            buzzer1.duty(0)
            buzzer2.duty(0)

            # -------------------------------------------------
            # Reset mail counter
            # -------------------------------------------------

            mail_send_count = 0


# -------------------------------------------------
# Program Entry Point
# -------------------------------------------------

if __name__ == '__main__':
    fire_alarm()