import machine
import time
import urequests
import network
import dht

# ThingSpeak settings
THINGSPEAK_API_KEY = "YVDU6T4V5ACXH5AJ"
THINGSPEAK_URL = "http://api.thingspeak.com/update"

# Wi-Fi settings
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASSWORD = ""

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

def read_room_temperature_humidity():
    try:
        dht_sensor.measure()
        temperature = dht_sensor.temperature()
        humidity = dht_sensor.humidity()
        return temperature, humidity
    except Exception as e:
        print("Failed to read sensor:", e)
        return None, None

def send_data_to_thingspeak(temperature, humidity):
    try:
        params = "api_key={}&field1={}&field2={}".format(THINGSPEAK_API_KEY, temperature, humidity)
        url = THINGSPEAK_URL + "?" + params
        response = urequests.get(url)
        response.close()
        print("Data sent to ThingSpeak")
    except Exception as e:
        print("Failed to send data to ThingSpeak:", e)

# Initialize Wi-Fi connection
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect(WIFI_SSID, WIFI_PASSWORD)

timeout = 15
start = time.time()

print("Connecting to Wi-Fi...")

while not wifi.isconnected():
    if time.time() - start > timeout:
        print("Failed to connect to Wi-Fi")
        break
    time.sleep(1)

if wifi.isconnected():
    print("Connected to Wi-Fi:", wifi.ifconfig())
else:
    print("No Wi-Fi connection, stopping.")

if wifi.isconnected():
    if __name__ == "__main__":
        try:
            while True:
                temperature, humidity = read_room_temperature_humidity()
                if temperature is not None and humidity is not None:
                    print("Temperature: {:.2f} °C, Humidity: {:.2f} %".format(temperature, humidity))
                    send_data_to_thingspeak(temperature, humidity)
                else:
                    print("Sensor read failed, skipping sending data")
                time.sleep(15)
        except KeyboardInterrupt:
            print("Program interrupted by user")