ESP8266 Smoke Detector with Audio Alert | MQ135 Sensor + DFPlayer Mini

In this course, you will learn how to create a smoke detection system using the ESP8266, the MQ-135 gas sensor, and the DFPlayer Mini audio module. When smoke is detected, the system triggers an audio alert through the DFPlayer Mini, playing a sound to warn users of the danger. We will use an OLED display to show the real-time status, and a speaker to play an audio file indicating smoke detection. This project is great for adding a layer of security and alertness to homes or small projects, demonstrating how sensors and audio feedback can work together.