#include <Wire.h>
#define MQ3_PIN A0  // Analog input for MQ-3 sensor

#define GSM_TX 7  // ESP32 TX → GSM RX
#define GSM_RX 6  // ESP32 RX ← GSM TX
#define GSMBaud 9600  // Adjust for your GSM module

HardwareSerial gsmSerial(2);  // UART2 for GSM

void setup() {
    Serial.begin(115200);
    gsmSerial.begin(GSMBaud, SERIAL_8N1, GSM_RX, GSM_TX);

    pinMode(MQ3_PIN, INPUT);
    Serial.println("MQ-3 Alcohol Sensor Initialized...");
}

void loop() {
    int sensorValue = analogRead(MQ3_PIN);
    float alcoholLevel = sensorValue * (5.0 / 1023.0);  // Convert to voltage

    Serial.print("Alcohol Level: ");
    Serial.println(alcoholLevel);

    if (alcoholLevel > 0.5) {  // Threshold for detection
        Serial.println("ALCOHOL DETECTED! Sending Alert...");
        sendAlert();
    }

    delay(2000);
}

void sendAlert() {
    String message = "ALERT: Alcohol detected in helmet! Immediate medical response required.";
    
    gsmSerial.println("AT+CMGF=1");  // Set SMS mode
    delay(100);
    gsmSerial.println("AT+CMGS=\"+1234567890\"");  // Replace with recipient's number
    delay(100);
    gsmSerial.println(message);
    delay(100);
    gsmSerial.write(26);  // End SMS command (Ctrl+Z)
    
    Serial.println("Alert Sent to Medical Response Team!");
}