from machine import Pin, PWM , UART , ADC, time_pulse_us
import network
import dht
import time
import blynk

BLYNK_TEMPLATE_ID = "TMPL22S4-6tpz"
BLYNK_TEMPLATE_NAME = "semester 1 project"
BLYNK_AUTH_TOKEN = "qz7txLLv1-EEXHB5or14BNjgxF-PpcpK"

# DHT22
dht_sensor = dht.DHT22(Pin(14))

# Gas Sensor
gas_sensor = Pin(25, Pin.IN)

# Ultrasonic
trig = Pin(5, Pin.OUT)
echo = Pin(18, Pin.IN)

#Servo
pwm = PWM(Pin(26), freq=50)
servo2 = PWM(Pin(27), freq=50)

def angle_to_duty(angle):
    return int(((angle / 180) * 2 + 0.5) / 20 * 1023)

def set_pwm(angle):
    pwm.duty(angle_to_duty(angle))

def set_servo2(angle):
    servo2.duty(angle_to_duty(angle))

#LED
led = Pin(2, Pin.OUT)

#UART
uart = UART(1, baudrate=9600, tx=Pin(17), rx=Pin(16))

#blynk connection
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect("Wokwi-GUEST", "")
print("Connecting WiFi...")
while not wifi.isconnected():
    time.sleep(0.1)


print("WiFi Connected!")

blynk = blynk.Blynk(
    BLYNK_AUTH_TOKEN,
    tmpl_id=BLYNK_TEMPLATE_ID,
    insecure=True
)


@blynk.on("connected")
def blynk_connected():
    print("Blynk Connected!")
    blynk.sync_virtual(0)

# Ultrasonic distance function
def measure_distance():
    trig.off()
    time.sleep_us(2)
    trig.on()
    time.sleep_us(10)
    trig.off()
    duration = time_pulse_us(echo, 1)
    distance = (duration * 0.034) / 2
    return distance

# Main Loop
while True:
    distance = measure_distance()

    if distance <= 30:
        near_flag = 1
    else:
        near_flag = 0

    gas_value = gas_sensor.value()
    print("Gas:", gas_value)

    if gas_value == 0:
        gas_leak = 1
    else:
        gas_leak = 0

        

    dht_sensor.measure()
    temp = dht_sensor.temperature()
    humidity = dht_sensor.humidity()


    if gas_leak == 1:
        set_pwm(180)
        set_servo2(180)
        led.on()
        door_status = "OPEN_GAS"

    elif distance > 0 and distance <= 30:
        set_pwm(180)
        set_servo2(180)
        led.off()
        door_status = "OPEN_PERSON"

    else:
        set_pwm(0)
        set_servo2(0)
        led.off()
        door_status = "CLOSED"


    #Blynk
    blynk.virtual_write(1, gas_leak)
    blynk.virtual_write(2, gas_leak)
    blynk.virtual_write(3, temp)
    blynk.virtual_write(4, humidity)
    blynk.virtual_write(0, door_status)


    data_str = f"{temp:.1f},{humidity:.1f},{near_flag},{door_status},{gas_value}\n"
    uart.write(data_str)
    print("sent:", data_str.strip())

    blynk.run()

    time.sleep(0.25)