Blynk MQ2 Smoke Detector Notification Gauge Feb 1, 20201 min readYouTube Tutorial:- https://www.youtube.com/watch?v=6Da5x9EHTcIMaterials:-Nodemcu ESP8266MQ-2 Smoke Gas SensorConnecttions:-A0 -- A0GND -- GNDVcc -- 3.3VCode:-