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ESP32-Based Smart Alarm System with GPS and GSM Connectivity

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Circuit Documentation

Summary

This circuit is designed to monitor environmental conditions using various sensors and provide alerts through visual and auditory signals. It includes an ESP32 microcontroller, an MPU-6050 accelerometer and gyroscope, an MQ-2 gas sensor, a KY-026 flame sensor, a buzzer, an OLED display, LEDs, a GPS module, and a GSM module. The ESP32 collects data from the sensors, processes it, and triggers alarms if necessary. It also displays the status on the OLED screen and sends notifications via SMS and email.

Component List

  1. ESP32 (30 pin)

    • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
    • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

  2. MPU-6050

    • Description: A 6-axis accelerometer and gyroscope sensor.
    • Pins: VCC, GND, SCL, SDA, XDA, XCL, AD0, INT

  3. MQ-2

    • Description: A gas sensor that detects smoke, propane, methane, and other combustible gases.
    • Pins: GND, VCC, ANALOG, Digital

  4. KY-026 Flame Sensor

    • Description: A sensor that detects flame and fire.
    • Pins: A0, GND, VCC, D0

  5. Buzzer

    • Description: An electronic device that produces a sound when activated.
    • Pins: PIN, GND

  6. OLED 128x64 I2C Monochrome Display VDD-GND

    • Description: A small OLED display for visual output.
    • Pins: VDD, GND, SCK, SDA

  7. LED: Two Pin (green)

    • Description: A green LED for visual indication.
    • Pins: cathode, anode

  8. Neo 6M GPS Module

    • Description: A GPS module for location tracking.
    • Pins: GND, TX, RX, VCC

  9. LED: Two Pin (red)

    • Description: A red LED for visual indication.
    • Pins: cathode, anode

  10. Sim800l

    • Description: A GSM module for sending SMS.
    • Pins: NET, RST, VCC, RXD, TXD, GND

  11. MB102 Breadboard Power Supply Module 3.3V/5V

    • Description: A power supply module for providing 3.3V and 5V outputs.
    • Pins: VCC, GND, 3.3V, 5V

Wiring Details

ESP32 (30 pin)

MPU-6050

MQ-2

KY-026 Flame Sensor

Buzzer

OLED 128x64 I2C Monochrome Display VDD-GND

LED: Two Pin (green)

Neo 6M GPS Module

LED: Two Pin (red)

Sim800l

MB102 Breadboard Power Supply Module 3.3V/5V

Code Documentation

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <TinyGPS++.h>
#include <SoftwareSerial.h>
#include <WiFi.h>
#include <SMTPClient.h>

// Define pins
#define MPU_SCL 22
#define MPU_SDA 21
#define MQ2_ANALOG 35
#define FLAME_SENSOR_PIN 19
#define BUZZER_PIN 25
#define RED_LED1_PIN 26
#define RED_LED2_PIN 27
#define GREEN_LED_PIN 14
#define GSM_RX_PIN 16
#define GSM_TX_PIN 17
#define GPS_RX_PIN 18
#define GPS_TX_PIN 19

// Initialize components
Adafruit_SSD1306 display(128, 64, &Wire);
TinyGPSPlus gps;
SoftwareSerial gsmSerial(GSM_RX_PIN, GSM_TX_PIN);
SoftwareSerial gpsSerial(GPS_RX_PIN, GPS_TX_PIN);

void setup() {
  // Initialize Serial
  Serial.begin(115200);
  gsmSerial.begin(9600);
  gpsSerial.begin(9600);

  // Initialize I2C
  Wire.begin(MPU_SDA, MPU_SCL);

  // Initialize OLED
  if (!display.begin(SSD1306_I2C_ADDRESS, OLED_RESET)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Initialize pins
  pinMode(MQ2_ANALOG, INPUT);
  pinMode(FLAME_SENSOR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RED_LED1_PIN, OUTPUT);
  pinMode(RED_LED2_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);

  // Initialize Wi-Fi
  WiFi.begin("your-SSID", "your-PASSWORD");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  // Read sensors
  int mq2Value = analogRead(MQ2_ANALOG);
  int flameValue = digitalRead(FLAME_SENSOR_PIN);

  // Check for earthquake (MPU-6050)
  // Add your MPU-6050 reading and processing code here

  // Check for smoke
  if (mq2Value > SMOKE_THRESHOLD) {
    triggerAlarm("Smoke detected!");
  }

  // Check for flame
  if (flameValue == HIGH) {
    triggerAlarm("Flame detected!");
  }

  // Read GPS data
  while (gpsSerial.available() > 0) {
    gps.encode(gpsSerial.read());
  }

  // Display status on OLED
  display.clearDisplay();
  display.setCursor(0, 0