from machine import ADC, Pin
from time import sleep
import network
import urequests

# Wi-Fi credentials
SSID = "Wokwi-GUEST"
PASSWORD = ""

# ThingSpeak API key and URL
THINGSPEAK_API_KEY = "73D4FM7DNHLIVNJ2"
THINGSPEAK_URL = "https://thingspeak.com/channels/2660070/private_show"

# Setup the hardware
LED_green = Pin(16, Pin.OUT)
LED_red = Pin(17, Pin.OUT)
buzzer = Pin(18, Pin.OUT)
AnalogIn = ADC(Pin(34))  # ADC channel 0 on ESP32
AnalogIn.atten(ADC.ATTN_11DB)  # Full range: 0-3.3V
Conv = 3.3 / 4095  # Conversion factor for 12-bit ADC

# Function to connect to Wi-Fi
def connect_to_wifi(ssid, password):
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    while not wlan.isconnected():
        print("Connecting to Wi-Fi...")
        sleep(1)
    print("Connected to Wi-Fi:", wlan.ifconfig())

# Function to send data to ThingSpeak
def send_to_thingspeak(gas_value):
    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 Exception as e:
        print("Failed to send data:", e)

# Connect to Wi-Fi
connect_to_wifi(SSID, PASSWORD)

# Main loop
while True:
    sensor_value = AnalogIn.read()  # Read gas sensor value (12-bit ADC)
    gas_value = sensor_value * Conv  # Convert to volts
    print("Gas Value:", gas_value)
    
    # Send the gas value to ThingSpeak
    send_to_thingspeak(gas_value)
    
    # Gas value conditions
    if gas_value < 1:
        buzzer.off()
        LED_green.on()
        LED_red.off()
        sleep(0.1)
        LED_green.off()
        LED_red.off()
    elif 1 <= gas_value < 3:
        buzzer.off()
        LED_green.off()
        LED_red.on()
        sleep(0.1)
        LED_green.off()
        LED_red.off()
    elif gas_value >= 3:
        buzzer.on()
        LED_red.on()
        sleep(0.1)
        buzzer.off()
        LED_red.off()
    
    # Additional changes: Add warning message
    if gas_value > 2.5:
        print("Warning: High gas concentration detected!")
    
    sleep(1)  # Wait for 1 second before next reading