Micro Sensor Interface Modules


WiHART Systems is introducing a new product line of low power, very small wireless sensor modules called uSIMs. These devices are the smallest wireless sensors using standard protocols. The first product is the game changing WiVIB1 which utilizes a MEMS (nanotechnology) accelerometer to replace the piezoelectric sensors that are presently being used to measure vibration. (see WiVIB1 in uSIM section)


The uSIM products will consist of the sensor (or several sensors), a programmable microprocessor for custom software, a radio with standard based protocols and in many cases a free open source development environment. (certain radios may require a proprietary C compiler).


The uSIM devices are about 1 square inch, the size of a postage stamp.

The uSIMs will offer a variety of wireless radio options. Initially the WiVIB1 will be offered with three(3) options: a 15.4 radio (Zigbee, small wireless mesh), WiFi (802.11) and ISA100. (QTR 3 2010)


The first uSIM in the product line is the WiVIB1 which is a complete wireless vibration sensor node on a printed circuit board about an inch square (size of postage stamp).  It is a complete wireless sensor module consisting of programmable microprocessor, standard radio and vibration sensor.  It does not use a traditional piezoelectric sensor to detect vibration.  It utilizes a MEMS (nanotechnology) accelerometer  which gives performance comparable for exceeding  piezoelectric performance and provides for an extremely low power device.  The sensor is mounted directly on the board and does not utilize any external wires to connect to a piezoelectric sensor.  It is totally self contained.   ( please refer to uSIM/white papers/App Notes section of our website for WiVIB1 products) 

Software for Test Purposes and Small Mesh Network (preliminary) 

The uSIMs will be available with a small mesh network for test and production environments. The software development environment for application programming is provided free. The proprietary wireless networking software has a complete mesh routing protocol. It operates over the IEEE 802.15.4 radio and MAC layer. It is an excellent platform to learn about mesh networking in a relatively simple implementation. Perfect for getting started with wireless sensor networks. It can be the basis of a production environment. All source code is available.

Small object size. A minimal build, with only the networking software and a tiny example application, uses only about 6KB for an end node.

Self-forming network. Nodes power up, find a network, and associate to it.

Self-healing network. Nodes re-associate upon a failure to communicate.

Multi-hop routing. Nodes can be multiple hops away from each other

Very configurable, with the ability to add or remove features at compile time.

Features include 6LoWPAN frames, end node sleeping, and a terminal mode.

High Performance with very small footprint


The network is organized as a tree, with the coordinator having a number of associated nodes as children, and router nodes having their own associated children as well. Each node has exactly one parent, which is also the node's link to every other part of the network.






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