Multifunctional Miners Helmet Design based on Wireless Sensor Network Technology
Han Qiu, Zhiyuan Chen, Fanghao Zhong · 2015
At present, domestic coal mine safety monitoring mainly realize the function of downhole data acquisition, such as the collection of gas, wind speed, temperature and other data.But the down hole data is not in full organization, use and manage on the inoue, meanwhile coal mine has the shortcoming of not flexible safety equipment , high defects of integration .This article design with three major functions : real-time monitoring of gas, precise positioning, lighting the of the miners helmets and PC (including the PC and the mobile terminal) monitoring systems.Taking miners helmet as the carrier, erected precise positioning systems and gas real-time monitoring system based on the acceleration sensor MPU6050 and meter step algorithm , we propose a suitable mobile node (Donetsk) more topologies, and by moving the nodes and fixed nodes signal transmission network to the monitoring center .This work test result shows that miners positioning error is less than 3m and gas monitoring systems , lighting function properly. Research StatusChina is the world's largest producer of coal, accounting for 31% of world production.While China's basic coal as an important energy and materials, occupies an extremely important strategic position in the national economy.In China's energy structure, coal accounts for 70% of China's primary energy production and consumption structure , and it will continue to be China's major coal energy in a fairly long period of time.Coal-dominated energy structure in the short term is difficult to change.However, compared with countries in the world, China's major coal-producing coal mines not only has more complex geological structure, mainly to underground mining, but also has more serious natural disasters.In recent years, China's coal mine accidents occur frequently, not only causing economic losses but also caused heavy casualties, the security issue has become the bottleneck of coal production.Statistics show that China's coal mines one million tons mortality rate is 100 times of the United States ,10 times of India's and economic losses caused in developing countries production safety accidents reached more than 2500 billion yuan . Multifunction helmet designThe overall design Miners helmet is designed with three functions: a real-time monitoring with a gas, precise positioning, lighting ,which can effectively improve mine safety.By MPU6050 for accurate positioning, and uses the Java language PC software for mobile terminal, serial communication PC side.Central control module of the helmet is STM32F051R8 and the power supply is 3.3V.STM32F051R8 collected information of X axis, Y axis, Z axis in acceleration sensor , and information about gas concentration gas sensor then transmitter via the RF module; sensor awaken or off mode selection is configured through STM32's I / O port. Hardware DesignPower Design Using 8.4V-0.5Aconstant current charger to supply Section II Lithium battery,with the output 7.4V by LM2596 regulator module and output 5V supply AMS 1117 regulator module and gas sensors and MPU6050 six-axis acceleration sensor, AMS1117 regulator module output 3.3 V supply