JLH Labs micro-networking technology is based on an ultra-low power hardware platform.  Each node or “mote” has the capability of being a network routing node or a sensor/actuator node. By consuming less that 2 uA when idle a battery operated node can last for years without requiring external maintenance. 


Every node in a micro-network contains an embedded processor and an RF transceiver.  FSK based communication ensures and optimal power to range ratio and allows communication links to be robust against external interference.  Per-link bit rates up to 76.8 Kbps are possible over distances exceeding 300 feet.


JLH Labs networking technology has been developed through years of experimentation that included several generations of hardware and software.



The weC Node




The weC node was developed in the Fall of 1999 by researchers at UC Berkeley.  It containes 8K of program memory and just 512 bytes of memory.  On-board temperature and light data could be wirelessly communicated over it 9600 baud on-off keyed radio.  An internal antenna provided a range of up to 15 feet.



The Rene Node











Developed in the summer of 2000, Rene node expanded on the capabilities of the weC node by increasing available program and data storage.  Additionally, it provided a 51-pin expansion interface that allow for connections to both analog and digital sensors.  As a development platform, hundreds of sensor boards have been designed to interface to the Rene node.  It is equipped with 8K of program memory, 32K of EEProm and is capable of being reprogrammed over the radio link.  It communicates at 19,200 via an on-off keyed 916 Mhz radio.  An external antenna allows for a communication rage of up to 100 feet.



The DOT Node


Developed in the summer of 2001, Dot shrunk the capabilities of the Rene node into a compact 1” node.  A complete node including sensor, computation, communication, and a battery fit in a package the size of four stacked quarters.  It was unveiled at the 2001 Intel Developers Forum in as the cornerstone of an 800 node demonstration network.  The Dot platform had 16 KB of program memory and 1 K of data memory.  It had the same communication capabilities of the Rene platform.



The Mica Node


The Mica node was developed as the foundation of the NEST (Network Embedded Systems Technology) project under DARPA (Defense Advanced Research Projects Agency).  Designed to facilitate the exploration of wireless sensor networking, it has been used by over 200 different research organizations.  Mica contains the same expansion bus as the Rene node allowing it to utilize all existing sensor boards.  The Mica node increases the radio communication rate to 40 Kbps though using specialized hardware accelerators and amplitude-shift-keying.  Mica includes 128 Kbps of program memory and 4 K of data memory.  It is capable of being radio-reprogrammed and has a line-of-sight rage of over 100 feet.  Mica has been used in applications ranging from military vehicle tracking to remote environmental monitoring.


The Spec Node


Spec was designed in the fall of 2002 by Jason Hill to be a highly integrated, single-chip wireless node.  The CPU, memory, and RF transceiver are all integrated into a single 2.5x2.5mm piece of silicon.  Fabricated by National Semiconductor, it was successfully demonstrated in March of 2003.  Spec contains specialized hardware accelerators designed to improve the efficiency of multi-hop mesh networking protocols.  Additionally, in includes an ultra-low power transmitter that drastically reduces overall power consumption.  Spec represents the future of embedded wireless networking.