import machine
import network
import time
import urequests
import ujson
import dht

# WiFi credentials
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

# ThingSpeak credentials
THINGSPEAK_API_KEY = "GPRJQ9GXHZTCP5H1"
THINGSPEAK_URL = "https://api.thingspeak.com/update"

# DHT22 (AM2302) sensor on analog pin
dht_sensor = dht.DHT22(machine.Pin(4))

# LDR sensor on GPIO 27
LDR_SENSOR_PIN = machine.ADC(1)

# Function to read analog pin
def read_ldr():
    ldr_data = LDR_SENSOR_PIN.read_u16()
    return ldr_data

def adc_to_lux():
    GAMMA = 0.7
    RL10 = 50
    voltage = ldr / 65535 * 5
    resistance = 2000 * voltage / (1 - voltage / 5)
    lux_value = (RL10 * 1e3 * pow(10, GAMMA) / resistance) ** (1 / GAMMA) 
    return lux_value

def read_room_temperature_humidity():
    dht_sensor.measure()
    temperature = dht_sensor.temperature()
    humidity = dht_sensor.humidity()
    return temperature, humidity

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

# Initialize tthe Wifi connection
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(WIFI_SSID,WIFI_PASSWORD)

# wait for the Wi-Fi connection to establish
while not wifi.isconnected():
  time.sleep(1)

print("Connected to Wi-Fi")

if __name__ == "__main__":
  try:
    while True:
      ldr = read_ldr()
      print(f"ADC LDR:{ldr}")
      lux = adc_to_lux()
      print(f"Lux Value: {lux}")
      temperature, humidity = read_room_temperature_humidity()
      print(f"Temp:{temperature}")
      print(f"Hum:{humidity}")
      
      send_data_to_thingspeak(ldr, temperature, humidity)
      print("Data sent to ThingSpeak")
      time.sleep(15) # Send data every 15 seconds (adjust the interval as needed)
  except KeyboardInterrupt:
    pass