**7.2 LabVIEW based results**

The LabVIEW front panel will exhibit the responses when the sensor incorporated within the sensor node collects the data within the environment. The threshold frontiers specified for this sensor are according to the OSHA standard. According to the threshold limit, different levels are displayed on the LabVIEW.

The sensors three levels are displayed on the front panel of LabVIEW. These levels are different for different sensors. For temperature sensor, cool level is displayed using green colored LED. Normal level of temperature is displayed using yellow colored LED, while red colored LED shows hot level of temperature. A voltmeter and pollution level meter is given, for easiness of users, to monitor the different pollution level. For CO sensor, Normal level is displayed using green color square LED. Hazardous level of CO is displayed using yellow color square LED, while red color square LED shows risky level of CO. For NOx sensor, normal level is displayed using green colored LED, unhealthy level of NOx is displayed using yellow colored LED, while red colored LED shows hazardous level of NOx. Low level of humidity is displayed using green colored LED. Normal level of humidity is displayed using yellow colored LED, while red colored LED shows high level of humidity. The RSPM levels such as normal, unhealthy and hazardous are displayed using green, yellow and red oval LED's respectively. The rationale of GUI is to erect the system extra interactive and superficial. The programming structure is shown in **Figure 23**. The real execution of wireless air quality monitoring system is shown in **Figure 24**.

## **7.3 IoT based result**

Internet of things (IoT) based system helps to detect the existing level of perilous gases in the environment. The system assists to obtain the data from any locality where the mechanism is installed. All the data can be perceived in the smartphone app. The present system uses the Blynk app. The relevance for the IoT-based air

#### **Figure 22.**

*Arduino coding for air quality monitoring system.*
