The world is constantly evolving and so is technology. One of the newest technologies is being implemented more and more into everyday life is the Internet of Things (IoT), which connects all the desired objects to the network. In this research project, an IoT based real-time monitoring system is created from scratch. The system detects gases that in their excess, can cause health problems. In addition, an alert system is established though a public message to the well-known social platform Twitter. Therefore, during the process of research, assembly and programming, knowledge about the basic elements of electronics, embedded C Language and the internal functioning of a system based on the Internet of Things has been acquired.