from machine import Pin, I2C
from i2c_lcd import I2cLcd
import utime
import dht
import network
import urequests

# Wi-Fi credentials
WIFI_SSID = "get password from thamilmaran"
WIFI_PASSWORD = "easypassword"

# ThingSpeak API details
THINGSPEAK_API_KEY = "BD51KPMCJ2746B79"
THINGSPEAK_URL = "https://api.thingspeak.com/update"

# Pin setup
dht_sensor = dht.DHT22(Pin(16))
relay_bulb = Pin(17, Pin.OUT)  # Controls the incandescent bulb (heating)
buzzer = Pin(15, Pin.OUT)      # Buzzer for alerts
switch = Pin(14, Pin.IN, Pin.PULL_UP)  # Switch input pin (pull-up resistor)

# I2C LCD setup
i2c = I2C(0, scl=Pin(1), sda=Pin(0), freq=400000)
lcd = I2cLcd(i2c, 0x27, 4, 20)  # Configure for 20x4 LCD

# Threshold values
TEMP_MIN = 37.5
TEMP_MAX = 38.0
HUMIDITY_MIN = 50
HUMIDITY_MAX = 60

# Initial settings
relay_bulb.off()
days = 0

# Variables to track display state
display_alert = True  # Toggle between alert status and live readings

# Wi-Fi connection
def connect_to_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(WIFI_SSID, WIFI_PASSWORD)
    lcd.clear()
    lcd.putstr("Connecting to WiFi")
    while not wlan.isconnected():
        utime.sleep(1)
        lcd.putstr(".")
    lcd.clear()
    lcd.putstr("WiFi Connected")
    print("Connected to WiFi:", wlan.ifconfig())

# ThingSpeak data upload
def send_to_thingspeak(temp, humidity):
    """Send data to ThingSpeak."""
    try:
        data = {
            "api_key": THINGSPEAK_API_KEY,
            "field1": temp,
            "field2": humidity,
        }
        response = urequests.post(THINGSPEAK_URL, json=data)
        print("ThingSpeak Response:", response.text)
        response.close()
    except Exception as e:
        print("Error sending to ThingSpeak:", e)

def buzzer_alert(alert_type):
    """Generates specific buzzer patterns for alerts."""
    if alert_type == "low_temp":
        for _ in range(2):
            buzzer.on()
            utime.sleep(0.2)
            buzzer.off()
            utime.sleep(0.2)
    elif alert_type == "high_temp":
        for _ in range(3):
            buzzer.on()
            utime.sleep(0.1)
            buzzer.off()
            utime.sleep(0.1)
    elif alert_type == "low_humidity":
        for _ in range(2):
            buzzer.on()
            utime.sleep(0.4)
            buzzer.off()
            utime.sleep(0.4)
    elif alert_type == "high_humidity":
        for _ in range(4):
            buzzer.on()
            utime.sleep(0.1)
            buzzer.off()
            utime.sleep(0.1)

def control_system(temp, humidity):
    """Controls the bulb and fan to maintain temperature and humidity."""
    # Temperature control
    if temp < TEMP_MIN:
        relay_bulb.on()  # Turn on bulb to increase temperature
    elif temp > TEMP_MAX:
        relay_bulb.off()  # Turn off bulb
    else:
        relay_bulb.off()

    # Humidity control
    if humidity < HUMIDITY_MIN:
        buzzer_alert("low_humidity")
    elif humidity > HUMIDITY_MAX:
        buzzer_alert("high_humidity")

def update_lcd(temp, humidity, days, display_alert):
    """Updates the LCD display with alternating readings and alert messages."""
    lcd.clear()
    if display_alert:
        if temp < TEMP_MIN:
            lcd.putstr("Alert: LOW TEMP")
        elif temp > TEMP_MAX:
            lcd.putstr("Alert: HIGH TEMP")
        elif humidity < HUMIDITY_MIN:
            lcd.putstr("Alert: LOW HUMIDITY")
        elif humidity > HUMIDITY_MAX:
            lcd.putstr("Alert: HIGH HUMIDITY")
        else:
            lcd.putstr("System Stable")
    else:
        lcd.move_to(0, 0)
        lcd.putstr(f"Temp: {temp:.1f}C")
        lcd.move_to(0, 1)
        lcd.putstr(f"Humidity: {humidity:.1f}%")
        lcd.move_to(0, 2)
        lcd.putstr(f"Days: {days:.1f}")

# Connect to Wi-Fi
connect_to_wifi()

while True:
    if switch.value() == 0:  # If the switch is ON (assuming active low)
        try:
            # Measure temperature and humidity
            dht_sensor.measure()
            temp = dht_sensor.temperature()
            humidity = dht_sensor.humidity()

            # Control temperature and humidity
            control_system(temp, humidity)

            # Send data to ThingSpeak
            send_to_thingspeak(temp, humidity)

            # Alternate display every 5 seconds
            update_lcd(temp, humidity, days, display_alert)
            display_alert = not display_alert  # Toggle state

            # Wait for 5 seconds
            utime.sleep(5)

            # Increment day counter based on elapsed time
            days += 5 / (24 * 60 * 60)  # Increment days (5-second loop)

        except Exception as e:
            # Handle sensor errors
            lcd.clear()
            lcd.putstr("Sensor Error")
            print(e)
            utime.sleep(2)

    else:
        # If switch is OFF, display "System OFF" and do nothing
        lcd.clear()
        lcd.putstr("System OFF")
        utime.sleep(1)