Project Documentation

Arduino UNO-Based Alcohol Detection and GPS Tracking System with Wi-Fi Connectivity

Circuit Documentation

Summary

This circuit integrates an Arduino UNO microcontroller with various sensors and modules to create a system capable of detecting alcohol levels, obtaining GPS coordinates, and transmitting data via a Wi-Fi module. The system also includes a motor driver to control a DC motor and a buzzer for alerts.

Component List

Arduino UNO
- Description: Microcontroller board based on the ATmega328P.
- Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
MQ-3 Breakout
- Description: Alcohol sensor module.
- Pins: VCC, GND, DO, AO
GPS NEO 6M
- Description: GPS module for obtaining location data.
- Pins: VCC, RX, TX, GND
L298N DC Motor Driver
- Description: Dual H-Bridge motor driver for controlling DC motors.
- Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB
12V Battery
- Description: Power source for the motor driver.
- Pins: -, +
DC Motor
- Description: Motor to be controlled by the motor driver.
- Pins: pin 1, pin 2
Buzzer
- Description: Audio alert component.
- Pins: PIN, GND
Wi-Fi Module ESP8266-01
- Description: Wi-Fi module for data transmission.
- Pins: RX, GPIO0, GPIO2, GND, +3V3, Reset, CH-PD Chip power down, TX

Wiring Details

Arduino UNO

3.3V connected to +3V3 and CH-PD Chip power down of the Wi-Fi module ESP8266-01.
5V connected to VCC of the GPS NEO 6M and VCC of the MQ-3 Breakout.
GND connected to GND of the GPS NEO 6M, GND of the MQ-3 Breakout, GND of the L298N DC motor driver, GND of the buzzer, and GND of the Wi-Fi module ESP8266-01.
A0 connected to AO of the MQ-3 Breakout.
D12 connected to ENA of the L298N DC motor driver.
D11 connected to IN2 of the L298N DC motor driver.
D10 connected to IN1 of the L298N DC motor driver.
D8 connected to PIN of the buzzer.
D4 connected to TX of the GPS NEO 6M.
D3 connected to RX of the GPS NEO 6M.
D1 connected to RX of the Wi-Fi module ESP8266-01.
D0 connected to TX of the Wi-Fi module ESP8266-01.

MQ-3 Breakout

VCC connected to 5V of the Arduino UNO.
GND connected to GND of the Arduino UNO.
AO connected to A0 of the Arduino UNO.

GPS NEO 6M

VCC connected to 5V of the Arduino UNO.
GND connected to GND of the Arduino UNO.
TX connected to D4 of the Arduino UNO.
RX connected to D3 of the Arduino UNO.

L298N DC Motor Driver

GND connected to GND of the Arduino UNO and - of the 12V Battery.
ENA connected to D12 of the Arduino UNO.
IN2 connected to D11 of the Arduino UNO.
IN1 connected to D10 of the Arduino UNO.
OUT1 connected to pin 2 of the DC Motor.
OUT2 connected to pin 1 of the DC Motor.
5V connected to + of the 12V Battery.

12V Battery

- connected to GND of the L298N DC motor driver.
+ connected to 5V of the L298N DC motor driver.

DC Motor

pin 1 connected to OUT2 of the L298N DC motor driver.
pin 2 connected to OUT1 of the L298N DC motor driver.

Buzzer

PIN connected to D8 of the Arduino UNO.
GND connected to GND of the Arduino UNO.

Wi-Fi Module ESP8266-01

+3V3 connected to 3.3V of the Arduino UNO.
CH-PD Chip power down connected to 3.3V of the Arduino UNO.
GND connected to GND of the Arduino UNO.
RX connected to D1 of the Arduino UNO.
TX connected to D0 of the Arduino UNO.

Documented Code

#include <SoftwareSerial.h>

// Define pins for modules and components
#define MQ3_PIN A0         // MQ-3 sensor analog pin
#define BUZZER_PIN 8       // Buzzer pin
#define IN1 2              // L298N Motor Driver IN1
#define IN2 3              // L298N Motor Driver IN2
#define ENA 9              // L298N Motor Driver ENA
#define WIFI_TX 10         // ESP8266 TX pin
#define WIFI_RX 11         // ESP8266 RX pin
#define GPS_RX 4           // GPS RX pin
#define GPS_TX 5           // GPS TX pin

// Threshold for alcohol detection
#define ALCOHOL_THRESHOLD 300

// SoftwareSerial for Wi-Fi and GPS modules
SoftwareSerial esp8266(WIFI_RX, WIFI_TX);
SoftwareSerial gpsSerial(GPS_RX, GPS_TX);

void setup() {
  // Serial communication for debugging
  Serial.begin(9600);
  esp8266.begin(9600);
  gpsSerial.begin(9600);

  // Setup pins
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(ENA, OUTPUT);

  // Initialize motor and buzzer
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  analogWrite(ENA, 0); // Motor off
  digitalWrite(BUZZER_PIN, LOW);

  Serial.println("System initialized!");
}

void loop() {
  // Alcohol level reading
  int alcoholLevel = analogRead(MQ3_PIN);
  Serial.print("Alcohol Level: ");
  Serial.println(alcoholLevel);

  // Read GPS data
  String gpsData = readGPSData();
  if (gpsData.length() > 0) {
    Serial.println("Raw GPS Data: " + gpsData);
    double latitude, longitude;
    if (parseGPS(gpsData, latitude, longitude)) {
      Serial.print("Latitude: ");
      Serial.println(latitude, 6);
      Serial.print("Longitude: ");
      Serial.println(longitude, 6);

      // Send GPS data via ESP8266
      sendToServer(alcoholLevel, latitude, longitude);
    }
  }

  // Activate buzzer and stop motor if alcohol is detected
  if (alcoholLevel > ALCOHOL_THRESHOLD) {
    Serial.println("Alcohol detected! Stopping motor and activating buzzer.");
    digitalWrite(BUZZER_PIN, HIGH);
    stopMotor();
  } else {
    digitalWrite(BUZZER_PIN, LOW);
    runMotor();
  }

  delay(1000);
}

String readGPSData() {
  String data = "";
  while (gpsSerial.available() > 0) {
    char c = gpsSerial.read();
    if (c == '$') { // Start of NMEA sentence
      data = "";
    }
    data += c;
    if (c == '\n') { // End of NMEA sentence
      if (data.startsWith("$GPRMC")) { // RMC sentence contains position info
        return data;
      }
    }
  }
  return "";
}

bool parseGPS(String gpsData, double &latitude, double &longitude) {
  int commaIndex[12];
  int index = 0;

  // Find all comma positions in the NMEA sentence
  for