from machine import Pin , time_pulse_us , PWM ,UART
import dht ,time
import network
import BlynkLib

#setup ,Initialize pins

#1st , inputs (sensors)
dht_sensor = dht.DHT22(Pin(14))
gas_sensor = Pin(13, Pin.IN, Pin.PULL_UP)
echoPin = Pin(32, Pin.IN)
trigPin = Pin(33, Pin.OUT)

#2nd , outputs(actuators)
led = Pin(23, Pin.OUT)
servo_lock = PWM(Pin(18), freq=50)
servo_door = PWM(Pin(15), freq=50)

#3rd , Define communcation protocols
uart = UART(1, baudrate=9600, tx=Pin(17), rx=Pin(16))

#variables

door_status =0

# Function to measure distance
def measure_distance():
    trigPin.off()
    time.sleep_us(2)
    trigPin.on()
    time.sleep_us(10)
    trigPin.off()
    duration = time_pulse_us(echoPin, 1)
    distance = (duration * 0.034) / 2
    return distance

#function to change servo angles
def set_angle(angle):
    duty = int(((angle)/180 * 2 + 0.5) / 20 * 1023)
    return duty


############ Blynk Code : #############
# BLYNK CONFIG
BLYNK_TEMPLATE_ID = "TMPL2X_YzjBW2"
BLYNK_TEMPLATE_NAME = "Smart Home Proj"
BLYNK_AUTH_TOKEN = "XjMmLFt_uZLr2L5YolzPig3C6Hqoxfwv"

WIFI_SSID = "Wokwi-GUEST"
WIFI_PASS = ""

wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(WIFI_SSID, WIFI_PASS)

print("Connecting to WiFi...")
while not wifi.isconnected():
    time.sleep(0.2)

print("WiFi Connected!")

blynk = BlynkLib.Blynk(BLYNK_AUTH_TOKEN, insecure=True)

@blynk.on("connected")
def connected():
    print("Blynk Connected!")
def send_to_blynk(temp, hum, gas, door):
    blynk.virtual_write(2, temp)
    blynk.virtual_write(3, hum)
    # Warning LED
    if gas == 0:
        blynk.virtual_write(1, 255)
    else:
        blynk.virtual_write(1, 0)
    # Door Status
    if door == 1:
        blynk.virtual_write(0, "Open")
    else:
        blynk.virtual_write(0, "Closed")
#######################################

#Main Loop
while True :
    dht_sensor.measure()
    temp = dht_sensor.temperature() # °C
    hmd = dht_sensor.humidity() # %

    gas = gas_sensor.value() #pmm

    dist = measure_distance() #cm

    #Safety Alert if gas value broke the threshold
    if gas ==0:
        led.on()
        print("⚠ Safety Alert : Gas Leak")
    else:
        led.off()

    #Smart door system (to oprn automatically when it is needed)
    if dist <=30:
        servo_lock.duty(set_angle(90))
        time.sleep(0.3)
        servo_door.duty(set_angle(90))
        door_status=1
        print("door opened")
    else :
        servo_door.duty(set_angle(0))
        time.sleep(0.3)
        servo_lock.duty(set_angle(0))
        door_status=0

    #sending data within uart 
    msg = "{:.1f},{:.1f},{},{}\n".format(temp, hmd, gas, door_status)
    uart.write(msg)
    print("Sent:", msg.strip())
    blynk.run()
    send_to_blynk(temp, hmd, gas, door_status)

    time.sleep(0.5)  # a new loop every 0.5s