# Wireless Data Acquisition System with Feedback Function
## 4 Conclusions  
In this article, the authors propose the concept of building a wireless DAS, free from some of the disadvantages of analogues and which has additional useful functions in comparison with them. The structure of the main DAS module, the design of intelligent wireless sensors, and a method for connecting them to the main module have been developed, significantly reducing the number and length of connecting wires. The use of an infrared communication channel in the described DAS in addition to the radio channel made it possible to organize a feedback channel protected from outside interference with the sensors and power equipment of the SWPP. On this basis, the following was achieved:  
1. Implement backup protection of SWPP batteries from overcharge and overdischarge;
2. Introduce into the system elements to increase the efficiency of natural energy use by automatically switching part of the SWPP loads from power from the public power grid to power from natural energy when there is an excess of it and vice versa when there is a lack of it;
3. Organize prompt remote diagnostics of the status of sensors without connecting additional wires. In the future, this will make it possible to transform the data collection system into a full-fledged automatic control system for the operation of the SWPP with the functions of backup protection of the main elements of the SWPP against damage and abnormal operating conditions, adapted for effective collaboration with existing utility power supply networks. Successful full-scale tests of the developed system in the \"Green Energy\" hardware room of the Toraighyrov University SWPP proved its full functionality and the correctness of the design principles and technical solutions underlying it. The concept of constructing the DAS proposed in this article is suitable for constructing systems for the remote measurement and logging of almost any physical quantity and makes it possible to easily \begin{table}
\begin{tabular}{l c c c c c} \hline \hline Monitoring of GEPP using GSM & \(-\) & \(-\) & \(+/-\) & \(-\) & \(-\) & \(-\) \\ \hline Monitoring of GEPP based on Zigbee & \(+\) & \(-\) & \(+/-\) & \(-\) & \(-\) & \(+\) \\ \hline Monitoring of GEPP based on Internet & \(+/-\) & \(-\) & \(-\) & \(-\) & \(-\) & \(-\) \\ of Things & \(+/-\) & \(-\) & \(-\) & \(-\) & \(-\) & \(-\) \\ \hline Monitoring of GEPP using Bluetooth & \(-\) & \(-\) & \(+\) & \(-\) & \(-\) & \(-\) \\ \hline Monitoring of GEPP using Wi-Fi & \(-\) & \(-\) & \(-\) & \(-\) & \(-\) & \(-\) \\ \hline Monitoring of GEPP using radio and & \(+\) & \(+\) & \(+\) & \(+\) & \(+\) & \(+\) \\ IR channels & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Comparison of some features of existing and proposed data acquisition systems. increase the number of interrogated sensors to several dozen; so, the scope of application of the described DAS can be significantly expanded. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app14135553/s1](https://www.mdpi.com/article/10.3390/app14135553/s1)]([https://www.mdpi.com/article/10.3390/app14135553/s1](https://www.mdpi.com/article/10.3390/app14135553/s1)), Video S1: Distance Test. Conceptualization, A.M. ([PERSON]); data curation, A.M. ([PERSON]); formal analysis, A.K. ; funding acquisition, A.S.; investigation, A.M. ([PERSON]) and A.S.; methodology, A.K. and O.T. ; project administration, A.S.; resources, A.M. ([PERSON]); software, A.M. ([PERSON]); supervision, A.K. and O.T. ; validation, A.M. ([PERSON]), A.S. and A.M. ([PERSON]); visualization, A.M. ([PERSON]); writing--original draft, A.S.; writing--review and editing, O.T. All authors have read and agreed to the published version of the manuscript. This study was funded by the Committee of Science of the Ministry of Science and Higher Education of the Republic of Kazakhstan (grant no. AP15473220). Not applicable. The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.