Project Documentation

Arduino UNO Alcohol Detection System with GPS and GSM Module

Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to detect alcohol levels and send GPS coordinates via SMS when a threshold is exceeded. The circuit includes an Arduino UNO, an alcohol sensor (MQ-3), a SIM800L GSM module, a Neo 6M GPS module, an LCD display, a buzzer, an LED, a rocker switch, and a 3.7V battery. The Arduino UNO reads the alcohol sensor data, displays it on the LCD, and if the alcohol level exceeds a predefined threshold, it sends an SMS with the GPS coordinates and activates a buzzer and LED.

Component List

Buzzer
- Pins: PIN, GND
- Description: Emits sound when activated.
- Purpose: Alerts when the alcohol level exceeds the threshold.
LED: Two Pin (red)
- Pins: Cathode, Anode
- Description: Red LED.
- Purpose: Indicates high alcohol level.
MQ-3 Breakout
- Pins: VCC, GND, DO, AO
- Description: Alcohol sensor.
- Purpose: Detects alcohol levels.
3.7V Battery
- Pins: +, -
- Description: Power source.
- Purpose: Supplies power to the circuit.
Rocker Switch (SPST)
- Pins: 1, 2
- Description: Single-pole single-throw switch.
- Purpose: Controls power to the SIM800L module.
SIM800L
- Pins: NFT, RING, VCC, DTR, RST, MIC +, RXD, MIC-, TXD, SPK+, GND, SPK-
- Description: GSM module.
- Purpose: Sends SMS with GPS coordinates.
Neo 6M GPS Module
- Pins: GND, TX, RX, VCC
- Description: GPS module.
- Purpose: Provides GPS coordinates.
LCD 16x2 (Wokwi Compatible)
- Pins: VSS, VDD, V0, RS, RW, E, D0, D1, D2, D3, D4, D5, D6, D7, A, K
- Description: 16x2 character LCD.
- Purpose: Displays alcohol level and status messages.
5k Preset
- Pins: Fixed end 1, Fixed end 2, Variable end
- Description: Adjustable resistor.
- Purpose: Adjusts the contrast of the LCD.
Arduino UNO
- 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, +, -
- Description: Microcontroller board.
- Purpose: Controls the entire circuit.

Wiring Details

Buzzer

PIN connected to Arduino UNO D13
GND connected to Common Ground

LED: Two Pin (red)

Anode connected to Arduino UNO D7
Cathode connected to Common Ground

MQ-3 Breakout

VCC connected to Arduino UNO 5V
GND connected to Arduino UNO GND
AO connected to Arduino UNO A0

3.7V Battery

+ connected to Rocker Switch (SPST) Pin 1
- connected to Common Ground

Rocker Switch (SPST)

Pin 1 connected to 3.7V Battery +
Pin 2 connected to SIM800L VCC

SIM800L

GND connected to Common Ground
VCC connected to Rocker Switch (SPST) Pin 2
RXD connected to Arduino UNO D9
TXD connected to Arduino UNO D8

Neo 6M GPS Module

GND connected to Common Ground
VCC connected to Arduino UNO 5V
TX connected to Arduino UNO D0
RX connected to Arduino UNO D1

LCD 16x2 (Wokwi Compatible)

VSS connected to Common Ground
VDD connected to Arduino UNO 5V
V0 connected to 5k Preset Variable End
RS connected to Arduino UNO D12
RW connected to Common Ground
E connected to Arduino UNO D11
D4 connected to Arduino UNO D5
D5 connected to Arduino UNO D4
D6 connected to Arduino UNO D3
D7 connected to Arduino UNO D2
A connected to Arduino UNO 5V
K connected to Common Ground

5k Preset

Fixed End 1 connected to Arduino UNO 5V
Fixed End 2 connected to Common Ground
Variable End connected to LCD 16x2 V0

Documented Code

#include <SoftwareSerial.h>
SoftwareSerial sim(8, 9);
#include <TinyGPS++.h>
#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
float lattitude, longitude;
SoftwareSerial gpsSerial(0, 1); // rx, tx
TinyGPSPlus gps; // create gps object

int value; // variable to hold the value of alcohol

#define motor 10
#define buzzer 13
#define led 7

String number = "+919889342918"; // -> change with your number
int a;

void setup() 
{ 
  pinMode(motor, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
  a = 700;
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("    Subscribe");
  lcd.setCursor(0, 1);
  lcd.print(" AEROTECH INDIA");
  sim.begin(9600);
  gpsSerial.begin(9600); // connect gps sensor
  delay(6000);
  lcd.clear();
}

void loop() 
{
  value = analogRead(A0); // reading value from Arduino analog pin which is receiving value from sensor pin
  lcd.setCursor(0, 0); // setting cursor on LCD's 0th row and 0th column
  lcd.print("value of alcohol"); // writing string on LCD
  lcd.setCursor(0, 1); // setting cursor on 0th column of 1st row 
  lcd.print(value); // printing value on LCD
  delay(100); // waiting for 100 milliseconds 
  digitalWrite(motor, HIGH);
  digitalWrite(buzzer, LOW);  
  digitalWrite(led, LOW); 

  if (value > a)
  { 
    SendMessage();
  }
}

void SendMessage()
{
  digitalWrite(motor, LOW);
  digitalWrite(buzzer, HIGH);

  boolean newData = false;

  for (unsigned long start = millis(); millis() - start < 2000;)
  {
    while (gpsSerial.available() > 0)
    {
      if (gps.encode(gpsSerial.read()))
      {
        newData = true;
      }
    }
  }           

  if (newData)
  {
    Serial.print("Latitude= "); 
    Serial.print(gps.location.lat(), 6);
    Serial.print(" Longitude= "); 
    Serial.println(gps.location.lng(), 6);
    newData = false;
    delay(300);

    sim.println("AT+CMGF=1"); 
    delay(200);
    sim.println("AT+CMGS=\"" + number + "\"\r"); 
    delay(200);
    sim.print("http://maps.google.com/maps?q=loc:");
    sim.print(gps.location.lat(), 6);
    sim.print(",");
    sim.print(gps.location.lng(), 6);
    delay(100);
    sim.println((char)26); // ASCII code for ctrl-26
    delay(200);
    Serial.println("GPS Location SMS Sent Successfully.");

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sending ... ");
    lcd.setCursor(0, 1);
    lcd.print("Your Location");
    delay(5000);
    lcd.clear();
    delay(200);
    digitalWrite(buzzer, LOW);

    while (1)
    { 
      digitalWrite(led, HIGH