Currently, we have heard a lot about global warming effects from all over the world. Many studies show that the major cause comes from greenhouse gas emissions and CO2 is one of the major greenhouse gas sources. And this is the reason why many countries release measures to limit CO2 emission There are many ways that we can help to limit CO2 emissions, such as using EV cars, using renewable energy, recycling, etc. Many studies talk about waste sorting and recycling could reduce CO2 emissions. And that should be a simple way that everyone can help and save the world. To do the recycling, the waste sorting process is needed and that can start from home. A study said that using recycle scraps to make aluminum cans uses 95% less energy than making cans from raw material, this is only an example. However, waste sorting seems to be challenged in many developing countries. A study from the Katadata Insight Center (KIC) also shows that 50.8% of households have not sorted their waste, with 79% of them thinking that waste sorting is a difficult thing to do. The ultimate of this project is to build automatic waste sorting for households by just only tell the bin what the waste is. However, our 1st version of this project is to sort by informing the type of waste by naming the color. The color of this project refers to the official waste type announced by the Thai government. This will help the household create more discipline and understand how they should sort the waste when need to do it in the public. By using this SMART BIN version 2 for some time, we expect that one will understand waste type automatically in the future and become their discipline to do waste sorting in everywhere. And that will help reduce CO2 emissions and save our world at the end.