Design Of Outdoor Environment Monitoring System Based On Internet Of Things

With the continuous development of wireless technology and the constantly improvement in people's living standards,there are many kinds of the technology of "Internet of things" in the domestic market,but environmental issues are becoming increasing important.Whether it is to work and entertainment in a comfortable environment or to experiment and evaluate in the environment of farm,forest,flower court,ecological vegetation and etc.Most of them are monitored environment all kinds of parameter values by people,and some of them are tested and controlled through intelligent instruments.However,it is not idea in the actual application.Due to the limit of the wireless transmission distance,the parameters like air temperature,air humidity,gas concentration,soil temperature,soil humidity and light are often detected in a small area.Moreover,It fails to observe and control various kinds of sensitive parameters through convenient operation because the data collect of timeliness and stability are poor.The article focuses on the data transmission distance,the monitoring range,the data drop packet,timely and effective environmental parameters and designs a set of outdoor environmental monitoring system,which can be easily viewed all kinds of parameters through computer and cell-phone.In the design,the data wireless transmission of all kinds of the nodes in the outdoor is based on the method of LWB,which Communicates with indoor terminal module circuit board through 150 MHz wireless low frequency.Data transmission can use the way to the specified target,transmission channel and data,in order to reduce signal interference during transmission.The PIC16F877 A of Microchip company is the main control chip of the underlying hardware circuit of each transmitting and receiving node module and Allegro draws the painting of PCB,which can be used as the universal circuit board for the Internet of things environment of parameter detection and wireless transmission.Using the ESP8266 of ALIENTEK company as the indoor WIFI wireless sensor,and the outdoor detected data is sent to the computer by sign of WIFI.Writing computer application code in Visual Basic,we can view the data from the remote sensor in the form of a map and save the data to the database.Setting kinds of environment parameters,and sent to the cell-phone to remind users after these data are collected andanalysis.After the testing and verification of hardware and software,the environmental parameters detected are analyzed,compared and quantified.The test results show that the error of the hardware part is less than 2% through test environment kinds of parameters.The low frequency wireless transmission distance and increase the relay can extend the transmission distance reaching 8 to 10 km.Transport distance is proportion to the height of the ground antenna,and 2 meters higher than the ground can achieve expected value.The way to automatic combination of network can achieve one transmission circuit module control detect the circuit module of 1536 region.The part of software can be viewed the collected environment values at any time through the computer,and the data will be sent to the user's cell-phone if it is more than alert value and displayed in the upper computer application.Meanwhile,it also closes all kinds of Sensor power in the circuit through sending order of data in order to save energy.