import machine
import network
import time
import urequests
import ujson

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

# ThingSpeak API settings
THINGSPEAK_API_KEY = "YOUR_THINGSPEAK_API_KEY"
THINGSPEAK_URL = "https://api.thingspeak.com/update?api_key=" + THINGSPEAK_API_KEY + "&field1=0"

# LDR sensor connected to an analog pin
LDR_SENSOR_PIN = machine.ADC(1)

# Calibration data (replace with your own values)
calibration_data = {
    1000: 100,   # Example: LDR value 1000 corresponds to 100 lux
    2000: 200,   # Example: LDR value 2000 corresponds to 200 lux
    # Add more calibration points as needed
}

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

# Function to convert LDR values to lux
def ldr_to_lux(ldr_value):
    # Interpolate lux value based on calibration data
    ldr_values = sorted(calibration_data.keys())
    lux_values = [calibration_data[ldr] for ldr in ldr_values]

    # Interpolation
    for i in range(len(ldr_values) - 1):
        if ldr_values[i] <= ldr_value <= ldr_values[i + 1]:
            lux_range = lux_values[i + 1] - lux_values[i]
            ldr_range = ldr_values[i + 1] - ldr_values[i]
            lux_per_unit_ldr = lux_range / ldr_range
            return lux_values[i] + (ldr_value - ldr_values[i]) * lux_per_unit_ldr

    return None  # Return None for values outside the calibration range

# Function to send data to ThingSpeak
def send_data_to_thingspeak(ldr):
    lux = ldr_to_lux(ldr)
    if lux is not None:
        data = {
            "api_key": THINGSPEAK_API_KEY,
            "field1": lux,
        }
        response = urequests.post(THINGSPEAK_URL, data=ujson.dumps(data), headers={"Content-Type": "application/json"})
        response.close()
        print(f"Lux: {lux}")
        print("Data sent to ThingSpeak")

# Initialize the Wi-Fi 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()
            send_data_to_thingspeak(ldr)
            time.sleep(15)  # Send data every 15 seconds (adjust the interval as needed)
    except KeyboardInterrupt:
        pass