import machine
import network
import urequests
import time

# ThingSpeak API settings
THINGSPEAK_API_KEY = "TSF3NPYXCYBEMGQX"
THINGSPEAK_URL = "https://api.thingspeak.com/update"

# GPIO setup
mq2 = machine.ADC(26)  # Analog input from MQ2
led = machine.Pin(15, machine.Pin.OUT)

# WiFi credentials
SSID = "One"
PASSWORD = "i2n8ghxc"

# Threshold value
THRESHOLD = 500  # Adjust this value as needed

# Connect to WiFi
print("Connecting to WiFi...")
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(SSID, PASSWORD)

while not wlan.isconnected():
    print(".", end="")
    time.sleep(0.5)

print(" Connected!")

# Main loop
while True:
    gas_value = mq2.read_u16() >> 4  # Normalize to 0-4095 range
    print("Gas value:", gas_value)

    # Send to ThingSpeak
    try:
        response = urequests.get(
            f"{THINGSPEAK_URL}?api_key={THINGSPEAK_API_KEY}&field1={gas_value}"
        )
        print("Data sent to ThingSpeak:", response.text)
        response.close()
    except:
        print("Failed to send data")

    # LED alert
    if gas_value > THRESHOLD:
        led.value(1)
    else:
        led.value(0)

    time.sleep(15)  # ThingSpeak accepts data every 15 sec