Project Documentation

Arduino-Based Alcohol Detection and Location Sharing System with SIM800L and GPS NEO 6M

Circuit Documentation

Summary

This document provides a detailed overview of an Alcohol Detection and Location Sharing System. The system uses an MQ-3 alcohol sensor to detect alcohol levels, an LCD to display the readings, a buzzer to alert when the alcohol level exceeds a threshold, and a SIM800L module to send location messages using GPS data from a NEO 6M module.

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
SIM800L
- Description: GSM/GPRS module for communication.
- Pins: NFT, RING, VCC, DTR, RST, MIC +, RXD, MIC-, TXD, SPK+, GND, SPK-
GPS NEO 6M
- Description: GPS module for location tracking.
- Pins: VCC, RX, TX, GND
LCD 16x2 (Wokwi Compatible)
- Description: 16x2 character LCD display.
- Pins: VSS, VDD, V0, RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7, A, K
MQ-3 Breakout
- Description: Alcohol sensor module.
- Pins: VCC, GND, DO, AO
Potentiometer
- Description: Variable resistor for adjusting LCD contrast.
- Pins: GND, Output, VCC
Buzzer
- Description: Sound alert device.
- Pins: PIN, GND
LED: Two Pin (red)
- Description: Indicator LED.
- Pins: cathode, anode

Wiring Details

Arduino UNO

3.3V: Connected to VCC of GPS NEO 6M
5V: Connected to VCC of SIM800L, VCC of Potentiometer, VCC of MQ-3 Breakout, VDD and A of LCD 16x2
GND: Connected to GND of GPS NEO 6M, cathode of LED, GND of SIM800L, GND of MQ-3 Breakout, VSS, K, and RW of LCD 16x2, GND of Potentiometer, and GND of Buzzer
A0: Connected to AO of MQ-3 Breakout
D13: Connected to anode of LED
D12: Connected to RS of LCD 16x2
D11: Connected to E of LCD 16x2
D8: Connected to PIN of Buzzer
D7: Connected to RST of SIM800L
D5: Connected to D4 of LCD 16x2
D4: Connected to DO of MQ-3 Breakout and D5 of LCD 16x2
D3: Connected to RX of GPS NEO 6M and D6 of LCD 16x2
D2: Connected to TX of GPS NEO 6M and D7 of LCD 16x2
D1: Connected to RXD of SIM800L
D0: Connected to TXD of SIM800L

SIM800L

VCC: Connected to 5V of Arduino UNO
GND: Connected to GND of Arduino UNO
RST: Connected to D7 of Arduino UNO
RXD: Connected to D1 of Arduino UNO
TXD: Connected to D0 of Arduino UNO

GPS NEO 6M

VCC: Connected to 3.3V of Arduino UNO
GND: Connected to GND of Arduino UNO
RX: Connected to D3 of Arduino UNO
TX: Connected to D2 of Arduino UNO

LCD 16x2 (Wokwi Compatible)

VSS: Connected to GND of Arduino UNO
VDD: Connected to 5V of Arduino UNO
V0: Connected to Output of Potentiometer
RS: Connected to D12 of Arduino UNO
RW: Connected to GND of Arduino UNO
E: Connected to D11 of Arduino UNO
D4: Connected to D5 of Arduino UNO
D5: Connected to D4 of Arduino UNO
D6: Connected to D3 of Arduino UNO
D7: Connected to D2 of Arduino UNO
A: Connected to 5V of Arduino UNO
K: Connected to GND of Arduino UNO

MQ-3 Breakout

VCC: Connected to 5V of Arduino UNO
GND: Connected to GND of Arduino UNO
DO: Connected to D4 of Arduino UNO
AO: Connected to A0 of Arduino UNO

Potentiometer

GND: Connected to GND of Arduino UNO
Output: Connected to V0 of LCD 16x2
VCC: Connected to 5V of Arduino UNO

Buzzer

PIN: Connected to D8 of Arduino UNO
GND: Connected to GND of Arduino UNO

LED: Two Pin (red)

cathode: Connected to GND of Arduino UNO
anode: Connected to D13 of Arduino UNO

Code Documentation

/*
 * Alcohol Detection and Location Sharing System
 * This code reads the alcohol level from the MQ-3 sensor, displays it on the LCD,
 * and if the level exceeds a threshold, it sounds a buzzer and sends a location
 * message using the SIM800L module and GPS NEO 6M module.
 */

#include <LiquidCrystal.h>
#include <SoftwareSerial.h>

// Pin definitions
const int ledPin = 13;
const int buzzerPin = 8;
const int mq3Pin = A0;
const int sim800lRxPin = 1;
const int sim800lTxPin = 0;
const int gpsRxPin = 3;
const int gpsTxPin = 2;

// Threshold for alcohol level
const int alcoholThreshold = 300;

// LCD pins: RS, E, D4, D5, D6, D7
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Software serial for SIM800L
SoftwareSerial sim800l(sim800lTxPin, sim800lRxPin);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  sim800l.begin(9600);

  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("Alcohol Level:");

  // Initialize pins
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(mq3Pin, INPUT);
}

void loop() {
  // Read alcohol level
  int alcoholLevel = analogRead(mq3Pin);

  // Display alcohol level on LCD
  lcd.setCursor(0, 1);
  lcd.print(alcoholLevel);

  // Check if alcohol level exceeds threshold
  if (alcoholLevel > alcoholThreshold) {
    // Sound the buzzer
    digitalWrite(buzzerPin, HIGH);

    // Send location message
    sendLocationMessage();
  } else {
    digitalWrite(buzzerPin, LOW);
  }

  delay(1000);
}

void sendLocationMessage() {
  // Get GPS data
  String gpsData = getGPSData();

  // Send SMS with location
  sim800l.print("AT+CMGF=1\r");
  delay(100);
  sim800l.print("AT+CMGS=\"+1234567890\"\r");
  delay(100);
  sim800l.print("Alcohol level exceeded! Location: ");
  sim800l.print(gpsData);
  sim800l.print((char)26);
  delay(100);
}

String getGPSData() {
  // Dummy GPS data for now
  return "Lat: 0.0000, Lon: 0.0000";
}

This code initializes the necessary components and continuously reads the alcohol level from the MQ-3 sensor. If the alcohol level exceeds a predefined threshold, it sounds a buzzer and sends a location message using the SIM800L module. The location data is currently a placeholder and should be replaced with actual GPS data from the NEO 6M module.