原标题：ST STEVAL－STWINKT1工业物联网无线节点开发方案

　　ST公司的STEVAL-STWINKT1是STWIN SensorTile无线工业节点开发套件和参考设计,可简化状态监测和预测性维护等高级工业IoT应用的原型设计和测试.具有一个核心系统板,该系统板具有一系列嵌入式工业级传感器和一个超低功耗微控制器,可对多种振动频率(包括超高频率音频和超声频谱)中的9自由度运动感应数据进行振动分析,以及高精度的本地温度和环境监控.该开发工具包补充了丰富的软件包和优化的固件库,以及云仪表板应用程序,所有这些都有助于加快端到端解决方案的设计周期.该套件通过板载模块支持BLE无线连接,并通过特殊的插件扩展板(STEVAL-STWINWFV1)支持Wi-Fi连接.还通过板载RS485收发器支持有线连接.核心系统板还包括一个STMOD +连接器,用于与STM32系列相关的兼容,低成本,小尺寸子板如LTE Cell Pack.除核心系统板外,该套件还配有480 mAh锂电池,STLINK-V3MINI调试器和一个塑料盒.主要用于工业物联网无线节点开发.本文介绍了STEVAL-STWINKT1主要特性,STWIN 核系统框图,STEVAL-STWINKT1电路图和材料清单.

　　STWIN SensorTile Wireless Industrial Node development kit and referencedesign for industrial IoT applications

　　The STWIN SensorTile wireless industrial node (STEVAL-STWINKT1) is adevelopment kit and reference design that simplifies prototyping and testing ofadvanced industrial IoT applications such as condition monitoring and predictivemaintenance.

　　The kit features a core system board with a range of embedded industrial-gradesensors and an ultra-low-power microcontroller for vibration analysis of 9-DoF motionsensing data across a wide range of vibration frequencies, including very highfrequency audio and ultrasound spectra, and high precision local temperature andenvironmental monitoring.

　　The development kit is complemented with a rich set of software packages andoptimized firmware libraries, as well as a cloud dashboard application, all provided tohelp speed up design cycles for end-to-end solutions.

　　The kit supports BLE wireless connectivity through an on-board module, and Wi-Ficonnectivity through a special plugin expansion board (STEVAL-STWINWFV1).

　　Wired connectivity is also supported via an on-board RS485 transceiver. The coresystem board also includes an STMod+ connector for compatible, low cost, smallform factor daughter boards associated with the STM32 family, such as the LTE Cellpack.

　　Apart from the core system board, the kit is provided complete with a 480 mAh Li-Pobattery, an STLINK-V3MINI debugger and a plastic box.

　　STEVAL-STWINKT1主要特性:

　　• Multi-sensing wireless platform implementing vibration monitoring andultrasound detection

　　• Built around STWIN core system board with processing, sensing, connectivityand expansion capabilities

　　• Ultra-low-power ARM Cortex-M4 MCU at 120 MHz with FPU, 2048 kbytes Flashmemory (STM32L4R9)

　　• Micro SD Card slot for standalone data logging applications

　　• Wireless BLE4.2 (on-board) and Wi-Fi (with STEVAL-STWINWFV1 expansionboard), and wired RS485 and USB OTG connectivity

　　• Option to implement Authentication and Brand protection secure solution withSTSAFE-A100 (footprint)

　　• Wide range of industrial IoT sensors:

　　–ultra-wide bandwidth (up to 6 kHz), low-noise, 3-axis digital vibration sensor(IIS3DWB)

　　– 3D accelerometer + 3D Gyro iNEMO inertial measurement unit(ISM330DHCX) with machine learning core

　　–ultra-low-power high performance MEMS motion sensor (IIS2DH)

　　–ultra-low-power 3-axis magnetometer (IIS2MDC)

　　–digital absolute pressure sensor (LPS22HH)

　　–relative humidity and temperature sensor (HTS221)

　　–low-voltage digital local temperature sensor (STTS751)

　　–industrial grade digital MEMS microphone (IMP34DT05)

　　–wideband analog MEMS microphone (MP23ABS1)

　　• Modular architecture, expandable via on-board connectors:

　　– STMOD+ and 40-pin flex general purpose expansions

　　– 12-pin male plug for connectivity expansions

　　– 12-pin female plug for sensing expansions

　　• Other kit components:

　　– Li-Po battery 480 mAh

　　–STLINK-V3MINI debugger with programming cable

　　– Plastic box

　　Predictive maintenance applications collect and process data from a wide variety of sensors in order to identifypotential failures in machinery before they happen. A principal requirement of such applications is that thecondition monitoring equipment is placed very close to relevant machine componentry for the data to be reliable,which is why the STWIN node is designed to be small but robust, self-powered and capable of wireless　communication.

　　Another application issue is the high volumes of preferably real-time data processing involved, which canoverwhelm centralized monitoring and control systems, and corresponding communication networks. Distributed(or decentralized) computing architectures represent a valid solution to this problem by performing data preprocessing　and analytical operations directly on the node. The STWIN kit supports and can demonstrate thisconcept through sample applications in the firmware package running on the STM32L4+ ultra-low-powermicrocontroller embedded on the core system board.

　　Finally, the actual sensing equipment can be subject to a very wide range of low frequency (imbalance ormisalignment), medium frequency (worn gears or bearings) and high frequency (worn cooling fan bearings)vibrations, which is why our node carries several high performance accelerometers, IMUs and magnetometers,capable of detecting movement along 9 axes to a very high degree of sensitivity. For very high frequencies in theorder of tens of kilohertz, vibration analysis is covered by sound and ultrasound applications based on datacoming from a digital microphone and a high performance analog microphone, respectively.

　　图1.STEVAL-STWINKT1外形图

　　图2.STWIN 核系统框图

　　图3.STEVAL-STWINKT1电路图(1):电源

　　图4.STEVAL-STWINKT1电路图(2):连接器

　　图5.STEVAL-STWINKT1电路图(3):传感器

　　图6.STEVAL-STWINKT1电路图(4):MCU

　　图7.STEVAL-STWINKT1电路图(5):音频,RS485,SD卡

　　图8.STEVAL-STWINKT1电路图(6):BLE, Wi-Fi, STSAFE