IoT Real-Time Gas and Smoke Detection System

Low-Cost LPG, Smoke, and Carbon Monoxide Monitoring with ESP32

Overview

This project is a compact, low-cost IoT system built to detect LPG, smoke, and carbon monoxide in real time.
It uses an ESP32 microcontroller paired with an MQ-Series gas sensor and provides three independent alert layers:

• Visual alerts using an OLED display
• Local audio alerts with a buzzer
• Remote notifications via the Blynk IoT Cloud

Even without an active internet connection, local alerts continue to function, ensuring uninterrupted safety.

---

Screenshots

Hardware Build

Blynk Dashboard

---

Features

• Real-time monitoring of gas concentration
• Threshold-based alert system
• Online dashboard and remote notifications through Blynk
• Local buzzer and OLED alerts even if Wi-Fi is offline
• Compact, low-power architecture suitable for continuous operation

---

Hardware Required

• ESP32 Development Board (DOIT DevKit V1)
• MQ-2 or MQ-135 Gas Sensor
• 0.96" or 1.3" I2C OLED Display
• Active or Passive Buzzer
• Jumper wires and breadboard

---

Circuit Diagram

Store the diagram inside a folder named diagrams/.

---