We have several parts interacting with each other. The data from the sensors is stored in the Arduino Uno and sent to the Raspberry Pi 2B through the WiFi module. The Raspberry Pi can then process the data and produce a graph with the current gas levels in a space. In order to receive data, the Raspberry Pi also needs a WiFi module. We use the TGS2442 CO sensor, the TGS2602 VOC sensor, and a simple TMP36 sensor for temperature. A CO2 sensor isn’t included due to long delivery times. The sensors and the Arduino function as a sensor node, the Raspberry Pi as the data sink.