this was me and my team diploma year project we works on it in 3 monthes to make it ready
Gas Guard created by bxl and his team
software requrement: arduino ide - blynk app hardware requirement: arduino mega/uno - NodeMCU - flame sensor - MQ2 gas sensor - HX711 load cell sensor - bazzar - led - 3d printed parts for the load cell sensor
you need to install the drivers for your nodeMCU you need to connect nodeMCU to arduno mega through serial connection
run both the nodeMCU code and Arduino mega code togther and you need to change the information of your blynk app before you run the code.
Read the bxl.