In the wireless monitoring system of gas detector, there are a few parts of hardware involved. This section will discuss on the design and function of each component that are connected to the Arduino in order to build the project. Along with that this section also explains how the circuitry connection between the components and microcontroller is made. This includes the sensor circuit and also the output circuit which comprises of LEDs, exhaust fan and a buzzer.
3.2.1 Gas sensor circuit
Figure 3.5: