Sensor node for data sampling and correlation analysis of CO2 concentration with air humidity, temperature, and light intensity

Carbon Dioxide gas (CO
₂
) gas contained in our air which has many roles in environment, but in a huge amount it became dangerous. To encounter that, the system for CO
₂
monitoring is needed. One of the most effective way is using Wireless Sensor Network (WSN). This system capable to monitor concentration of CO
₂
and another variable using sensor nodes. But not all of that parameters is correlated to concentration of CO
₂
. To make monitoring system runs efficiently, correlation analysis between variables is needed. This research conduct a correlation analysis between concentration of CO
₂
and humidity, temperature and light intensity from data collected by our own-made digital sensor node. Data gathered for seven days in one location with a fluctuate environment condition. Correlation calculated with Spearman's rho method. The result is CO
₂
and air humidity have a strong positive correlation with air humidity (0.726), weak negative correlation with light intensity (-0.319), and no correlation with air temperature (-0.008).