The Research Of The Mining Composite Sensor Based On PIC16F877

The coal mine accidents is occurred in China frequently in recent years which costs large mount of economic lost and casualty. However, the sensors for coal measurement applications are unfeasible which single type of signal could be detected and distributed in the mine tunnels separately. Consequently, the data transferring of the underground sub-stations and sensors is only depended upon the large scale of wire connections between them which the resources is much wasted and the precision and real-time ability of data collection are negatively affected as well. Hence, it is crucially necessary to avoid the hidden dangers in coal safety production. A mining composite sensor with the combination of the technologies of composite sensor and traditional detection is designed for the resolution of those serious issues.The research of the mining composite sensor is introduced in the aspects of hardware and software. On hardware designing, the single chip PIC16F877 is selected as core processor in accordance with the features like Harvard structure, RISC and cost-effective, etc. The detection, alarm display, RS232 communication interface circuits are designed; in the aspect of software, the noise from the sampling process is effectively removed with the algorithm of weighted average of recursive, and the zero drift of detection devices is compensated by the use of zero compensation algorithm; the whole system detection accuracy and reliability is improved by the use of multi-sensor information fusion method. Moreover, simulation analysis based on MATLAB for multi-algorithm in composite sensor utilization, and the feasibility and reliability of the data fusion algorithm of BP neural network applied in the system is proved successfully.The accomplishments of the mining composite sensor are built on levels of creativeness and breakthrough. First of all, the multi-type data is measured and transmitted synchronously underground that the resources of wire connections and space are saved, the precision of data transmission is improved and more importantly, a functional platform for the mining application of multi-sensor data fusion technology is provided; the data fusion is carried on with the BP algorithm in multi-sensor research. The application of standard communication interface for mining composite sensor is positively available for data transmitting. Hence, it is proved that advanced safely protected mining environment is realized by the design of composite sensors in mining production application.