And Implementation Of Intelligent Anti-lost Device Based On BLE Technology

With the development of science and technology, more and more intelligent devices come into the life of ordinary consumers. The emergence of Google Glass means that the time of wearable devices is coming, then Smart Watch and Smart BandSpring up in our lives here and there, predictably, the intelligent devices can make great influence to our work, study and life in the near future. The intelligent anti-lost device is a member of the wearable devices, it looks Simple,but it’s function is very powerful. Researching the anti-lost device helps us to know more about wearable devices, we can also make the foundation to develop other intelligent devices though the research.The most used wireless communication technology in wearable devices is Bluetooth 4.0, the technology combine traditional Bluetooth, fast Bluetooth with low energy together, many new innovative technology is used in this technology, it works at 2.4GHz ISM(Industry, Science,Medical) frequency band. The energy of the Bluetooth 4.0 is lower than traditional Bluetooth, a product used Bluetooth 4.0 can work well for several months or several years with a normal button cell.The referred Bluetooth 4.0 solution in this thesis is DA14580 designed by Dialog company, the TX current and RX current is controlled under 4 mA strictly, the standby time and service time of the products used this solution is twice longer than other similar solutions. As the low energy character,more and more product developers put DA14580 in the first place as the solution to develop wearable devices.The main content introduced in this thesis is the design and implementation of the intelligent anti-lost device based on BLE.First of all,the status and background of the wearable devices;Secondly,the thesis introduces the product form and the development tendency of intelligent wearable market according to the internet data;Thirdly,the thesis introduces the hardware design,including the power module,antenna module and peripheral module and so on;Fourthly,the thesis introduces the software design,including the application code in the DA14580 chip and the software used on the phone;Fifth,in order to perfect the relation between distance and Bluetooth RSSI(Received Signal Strength Indicator),the paper introduces two simple algorithm models and a modified model,then test the three models separately;In the end,a summary of the design work is given,and the lack of the system is introduced,then point out the direction in future work.