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Wireless data acquisition

Wireless data acquisition: NI Wi-Fi DAQ & NI WSN.

Depend of application you need to choose use NI WIFI DAQ or NI WSN. NI WI-FI DAQ-s are meant to stream data continuously back to a host PC or laptop. It use IEEE 802.11b/g technology.  A wireless sensor node (WSN) is typically a low-power, autonomous battery-operated device intended for long-term deployment in applications where measurements are needed only every few minutes, hours, or even days. WSN is done according to IEEE 802.15.4.

Wi-Fi data acquisition devices, on the other hand, behave in much the same way as a USB data acquisition device – a host PC collects data continuously (in real time) as the device acquires it. Both technologies are adopted to use indoors and outdoors.

 

Because the NI CompactDAQ chassis uses the same NI-DAQmx driver software as other NI data acquisition devices, you can develop your applications using NI LabVIEW; LabWindows™/CVI; ANSI C/C++; or Microsoft C#, Visual Basic, or Visual Basic .NET.

NI Wi-Fi Data Acquisition Devices

Wi-Fi data acquisition is an extension of PC-based data acquisition to measurement applications where wiring is difficult or cost-prohibitive. Wi-Fi data acquisition (DAQ) devices combine IEEE 802.11 wireless or Ethernet communication, direct sensor connectivity, and the flexibility of NI-DAQmx software for remote monitoring of electrical, physical, mechanical, and acoustic signals. The NI cDAQ-9191 holds a single C Series module and is capable of streaming continuous waveform data on each channel at more than 50 kS/s with 24 bits of resolution.

The NI cDAQ-9181 and NI cDAQ-9191 support over 50 NI C Series modules with measurements including voltage, current, temperature, force, strain, acceleration and many more. C Series modules offer direct sensor connections, NIST-traceable calibration, and built-in signal conditioning for a variety of measurements, including temperature, high-voltage digital I/O, strain, acceleration, current, and voltage. In addition to the NI cDAQ-9191 wireless chassis, you can use C Series modules interchangeably for measurement and control applications with different chassis, including 4- and 8-slot NI CompactDAQ chassis and CompactRIO, as well as the NI USB-9171 single module chassis and NI cDAQ-9181 Ethernet chassis. Download NI C Series Module Compatibility Chart [PDF].  View all C Series modules .

In addition, built-in NIST-approved 128-bit AES encryption and advanced IEEE 802.1X network authentication offer the highest commercially available network security (WPA2 Enterprise).  Authentication ensures that only authorized devices have network access, and encryption prevents data packets from being intercepted. Lean more in Tutorial.

NI wireless sensor network (WSN)

The NI wireless sensor network (WSN) platform provides a complete remote monitoring solution that consists of NI LabVIEW graphical programming software and new reliable, low-power wireless nodes for remote measurements. The NI WSN platform offers reliable connectivity from a gateway to end nodes at a distance of up to 300 m line of sight. Using mesh networking, routers extend the total distance from a gateway to an end node. Each wireless network can scale from tens to hundreds of nodes and seamlessly integrate with existing wired measurement and control systems.

Based on the IEEE 802.15.4 standard, the NI WSN protocol supports mesh routing, which means a WSN router can relay measurements from end nodes to a central gateway. If a primary router is unavailable and an alternate router exists, the protocol automatically routes measurements through the alternate path. 

The combination of LabVIEW and NI WSN measurements provides a reliable, low-power system for remote monitoring:  Industrial / Machine Condition / Distributed Temperature / Environmental /Energy / Structural Health / Transportation.

WSN Architectures

Combine different types of nodes and gateways to meet the unique needs of your application.

Create a simple, PC-based wireless sensor network (WSN) monitoring system with the NI WSN-9791 Ethernet gateway, or a headless, embedded monitoring system with the NI 9792 programmable gateway, which can run deployed NI LabVIEW Real-Time applications. For applications that require the combination of high-speed I/O (or control) and distributed wireless monitoring, take advantage of the NI 9795 C Series WSN gateway.

NI WSN-9792 Architecture

With the flexibility of Ethernet connectivity, you can add other devices and functionality to your WSN system. This can range from enterprise-level devices such as databases and servers to wired I/O, control systems, or third-party WSN products. LabVIEW Real-Time allows embedded data logging and open communication on the gateway, while the LabVIEW WSN Module allows node customization and local decision making at the node level.The NI  gateway connects through standard Ethernet to Windows PCs or LabVIEW Real-Time controllers.

LabVIEW also provides native Web services for remote data access and visualization over the Internet.  Besides the advanced processing and visualization capabilities that are common in LabVIEW, LabVIEW Web services give you the opportunity to publish your measurement data to a Web server, such as the integrated Web server on the NI 9792, delivering convenient remote access to your WSN from virtually anywhere. With this complete system architecture, you can quickly and easily acquire data using an NI WSN, process and host that data on a server, and then access the data conveniently and remotely from a wireless smart device, such as an iPhone or laptop.

 

 

Wireless Sensor Network Gateways NI WSN-9792 & NI 9791*

*-Not recommended for new designs.

WSN Measurement Nodes

The NI WSN nodes operate on four AA batteries and deliver up to three years of battery life at one sample per minute. The NI WSN-3202 voltage node offers four 16-bit analog inputs with ±10, ±5, ±2, and ±0.5 V selectable input ranges; four digital I/O lines; and the ability to source up to 20 mA at 12 V for powering external sensors. The NI WSN-3212 thermocouple input node provides four 24-bit thermocouple channels with support for J, K, R, S, T, N, B, and E thermocouple types; four digital I/O lines; and the ability to source up to 0.5 A on digital output channels.