## 2 Implementation of the System
The calibration of the CC811 and BME680 sensors is a crucial process in order to ensure precise and reliable indoor air quality monitoring. The CC811 sensor requires an initial baseline correction in order to account for sensor drift over time. This is achieved by exposing the sensor to clean air to establish a reference point. The baseline correction is vital as it adjusts the sensor's output to reflect true ambient conditions. Additionally, the sensor is subjected to environmental conditioning, whereby it is subjected to controlled variations in temperature and humidity. This step helps to understand the sensor's behavior under different conditions and allows for necessary adjustments to be made to maintain accuracy. Furthermore, the CC811 sensor is exposed to known concentrations of target gases. During this stage, the sensor's readings are compared to the known values, and adjustments are made to align the sensor's response with the actual gas concentrations. This process ensures that the sensor is able to accurately detect and quantify VOC and CO\({}_{2}\) levels in real-world scenarios. The BME680 sensor, which integrates gas, pressure, humidity, and temperature sensing capabilities, undergoes a similarly detailed calibration process. Temperature calibration is performed by placing the sensor in environments with known temperature levels and adjusting its readings to match these known values. Humidity calibration follows a similar procedure, where the sensor is exposed to environments with known humidity levels. In order to ensure the precise detection of gases, the BME680 sensor is exposed to standard concentrations of gases. Its response is then calibrated in order to account for any discrepancies. Additionally, the BME680 utilizes sophisticated compensation algorithms that integrate temperature and humidity data in order to correct gas concentration readings. These algorithms ensure that the sensor's output remains accurate under varying environmental conditions, accounting for potential cross-sensitivity effects among the different measured parameters. This comprehensive calibration process for both sensors ensures that they provide reliable and accurate data for indoor air quality monitoring, rendering them effective tools for maintaining healthy indoor environments. By meticulously calibrating these sensors, we can ensure they deliver high-quality performance, which is essential for applications in smart homes, HVAC systems, and environmental monitoring solutions. A comprehensive calibration of two sensors was conducted, with a focus on temperature, humidity, VOC, and CO\({}_{2}\) measurements. The calibration was performed by comparing the sensor readings to reference values obtained under controlled laboratory conditions. Post-calibration, the results demonstrated a significant improvement in the accuracy of both sensors. The calibrated data closely aligned with the laboratory reference values, indicating that the calibration procedure effectively reduced measurement discrepancies and enhanced overall sensor performance. Figure 3 illustrates the calibration results for temperature, humidity, VOC, and CO\({}_{2}\), respectively.