Research On Wireless Remote Sensing System Based On Embedded Micro - Controller

Recently, the intelligent home technology has made a great development;and the automatic tele-metering is one of the most important techniques in the smart home. The intelligent gas meter with automatically tele-metering function is also a tending direction. The wireless communications and networks have made a fundamental for the tele-metering. The gas measurement devices integrate the wireless communication so as to not only reduce the complexity of construction and wiring significantly, but also save much human labor and time.Nevertheless, it can provide the real-time information for cloud computing services. Therefore, it drew well attention of popular customers and production companies.This paper proposes a novel gas metering technique that can be directly connected with the internet through a wireless remote communication system.Based on the advanced embedded microprocessor MKL46, the system combines together the gas usage measurement and wireless transmission. Furthermore, the IC card made of SLE442 is used to exchange the gas information with the main processor, which includes the gas usage, charging fee, payment and other important information. Two wireless modules are integrated, CC1100 E and WiFi MT7681, for wireless communication to the gas metering management system.The information of the gas meter can be uploaded to the system via some wireless routing by the on-site resident building or houses. At the same time,the system workstation server can also use this path to control the individual gas meter one by one to reduce manual interaction and the system’s cost.In order to maintain the low power dissipation of gas meter electronic system, the time-sharing power supply is adopted. The embedded microprocessor system can use sleep-scheduling to decrease power consumption when the system is in waiting state because the gas metering has a small duration in one metering cycle. The wireless communication module CC1100 E operates with the technique of the transceiver of carrier sense and automatic wake-up by the address recognition, so its power consumption is dramaticallydecreased. The WiFi module only runs very few cases in a month, so it is in power-on condition when only the gas meter communicates with the main workstation, while it ceases to work in most time to save the power usage.According to theoretical analysis and practical experiments, the standby current consumption of the system is about 20 uA, and the effective wireless transmission distance is 150 meters. The results show that the system is effective and achieve our objective.