from machine import Pin, time_pulse_us
import network
from time import sleep, sleep_us
import urequests
import ujson
import dht
import math

#Wifi Credentials
ssid = "Wokwi-GUEST"
password = ""

# ThingSpeak API Setting
THINGSPEAK_API_KEY = "4KA5OZSQNVINM10V"
THINGSPEAK_URL = "https://api.thingspeak.com/update"

#ldr sensor connected to GPIO27
ldr_pin = machine.ADC(1)

#DHT22 (AM2302) sensor on GPIO 41
dht_sensor = dht.DHT22(machine.Pin(1))

led1 = machine.Pin(18, Pin.OUT)
led2 = machine.Pin(19, Pin.OUT)

trigger = Pin(17, Pin.OUT)
echo = Pin(16, Pin.IN)

#read analog pin
def read_ldr():
    ldr_data = ldr_pin.read_u16()
    #print(ldr_data)
    v_out = ldr_data / 65535 * 5
    #print(v_out)
    r_ldr = 2000*v_out/(1 - v_out / 5)
    lux = pow(50*1000*pow(10, 0.7)/r_ldr, (1/0.7))
    return lux

#Function to read room temperature and humidity
def read_room_temperature_humidity():
    dht_sensor.measure()
    temperature = dht_sensor.temperature ()
    humidity = dht_sensor.humidity()
    return temperature, humidity

def measure_distance():
    # Ensure trigger is low initially
    trigger.low()
    sleep_us(2)

    # Send a 10 microsecond pulse to the trigger pin
    trigger.high()
    sleep_us(10)
    trigger.low()

    # Measure the duration of the echo pulse (in microseconds)
    pulse_duration = time_pulse_us(echo, Pin.high)

    # Calculate the distance (in centimeters) using the speed of sound (343 m/s)
    distance = pulse_duration * 0.0343 / 2
    return distance

#send to Thingspeak
def send_cloud(ldr, temperature, humidity, data4):
    data = {
        "api_key":THINGSPEAK_API_KEY,
        "field1": ldr,
        "field2": temperature,
        "field3": humidity,
        "field4": data4,
    }
    response = urequests.post(THINGSPEAK_URL, data=ujson.dumps(data), headers={"Content-Type": "application/json"})
    response.close()

def send_cloud1(data1):
    data = {
        "api_key":THINGSPEAK_API_KEY,
        "field5": data1,
    }
    response = urequests.post(THINGSPEAK_URL, data=ujson.dumps(data), headers={"Content-Type": "application/json"})
    response.close()

def connect():
    # Connect to WLAN
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    while wlan.isconnected() == False:
        print('Waiting for connection...')
        sleep(1)
    ip = wlan.ifconfig()[0]
    print(f'Connected on {ip}')
    return ip

if __name__ == "__main__":
    connect()
    try:
        while True:
            ldr = read_ldr()
            temperature, humidity = read_room_temperature_humidity()
            distance = measure_distance()
            print(f"Lux: {ldr}")
            print(f"Temp: {temperature}")
            print(f"Hum: {humidity}")

            if ldr > 500 :
                led2.off()
                send_cloud1(0)

            if ldr <= 500 :
                led2.on()
                send_cloud1(1)

            if distance <= 50:
                led1.on()
                send_cloud(ldr, temperature, humidity,1)
                print("Data sent to ThingSpeak")
                print("\n-------------------------------\n")

            if distance > 50:
                led1.off()
                send_cloud(ldr, temperature, humidity,0)
                print("Data sent to ThingSpeak")
                print("\n-------------------------------\n")  

            sleep(5)
    except KeyboardInterrupt:
        pass