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

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

# ThingSpeak API settings
THINGSPEAK_API_KEY = "2O509SZM9TPDT9H7"
THINGSPEAK_URL = "http://api.thingspeak.com/update"

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

# Potentiometer for pH simulation
PH_SENSOR_PIN = machine.ADC(0)  # Analog pin 0

# LED for indicating soil condition
LED_PIN = machine.Pin(2, machine.Pin.OUT)  # GPIO pin 2

# Function to read pH value from potentiometer
def read_ph():
    ph_value = PH_SENSOR_PIN.read_u16() / 65535.0 * 7  # Simulate pH range from 0 to 7
    return ph_value

# Function to check soil condition based on pH
def check_soil_condition(ph):
    if 5 <= ph <= 6:
        print("Soil in good condition (pH: {:.2f})".format(ph))
        LED_PIN.value(0)  # Turn off the LED (green)
    else:
        print("Soil in poor condition (pH: {:.2f})".format(ph))
        LED_PIN.value(1)  # Turn on the LED (red)

# Function to read temperature and humidity from DHT22 sensor
def read_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(ph, temperature, humidity):
    data = {
        "api_key": THINGSPEAK_API_KEY,
        "field1": ph,
        "field2": temperature,
        "field3": humidity,
    }
    response = urequests.post(THINGSPEAK_URL, data=ujson.dumps(data), headers={"Content-Type": "application/json"})
    response.close()

# Initialize the 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:
            ph = read_ph()
            print("pH: {:.2f}".format(ph))
            check_soil_condition(ph)

            temperature, humidity = read_temperature_humidity()
            print("Temperature: {:.2f}°C, Humidity: {:.2f}%".format(temperature, humidity))
            
            send_data_to_thingspeak(ph, temperature, humidity)
            print("Data sent to ThingSpeak")

            time.sleep(10)  # Adjust the sleep interval as needed
    except KeyboardInterrupt:
        pass