Project Description: Our project is about a device that is important to use these days and the device is co2 detector.We can use it to measure the amount of co2 in the air we breath. The co2 detector can send you a message when the amount of co2 accumulate and rises in the air.We used ESP8266 as a microcontroller and we used MHz-19B as a co2 sensor. Then we took the code from crisap 94 (GitHub) after that we modified the code and uploaded to the microcontroller. We printed a 3D case to protect the device.