Wireless sensor devices are cable-free,
but they still require a battery that will
occasionally need replacement. While
transceivers with lower power consumption
have boosted battery life in some
products, their batteries ultimately will die
and require service.
The GreenPeak Lime CM-08 module
solves that problem for sensor monitoring
and control devices (see the figure). Developed
by GreenPeak Technologies, it uses
energy harvesting to eliminate battery
replacement and other power sources in
wireless sensor nodes.
This complete, standalone wireless system comprises a
transceiver, an antenna, low-power mesh network software,
and energy-harvesting capabilities. Based on the IEEE
802.15.4 (2.4 GHz) and ZigBee standards, it measures less
than a square inch and targets sensors, switches, and other
OEM controllers.
The GreenPeak module gets its energy from solar sources,
electromagnetic fields, and piezoelectric torsion. It then stores
the energy and carefully manages its application. Special power-
management algorithms and smart
power-up/down synchronization techniques
make optimum use of the
acquired energy. With the mesh network
configuration, each node can act as a
repeater, extending the overall communications
range even with ultra-low-power
transmissions.
The CM-08 operates in the 2.4-GHz U.S.
industrial, scientific and medical (ISM)
band. Additionally, it’s compatible with the
IEEE 802.15.4 and European EN 300 440
standards. An on-board processor can be
used for the application, eliminating the need for an external
processor. Related development and deployment software is
available as well.
The Lime CM-08 module targets medical and healthcare
devices, safety and security, building and home automation,
asset management, industrial automation, and other applications.
It costs $21 in 100,000-unit quantities. The starter kit is
$1290, and a developer’s suite goes for $6950.
GreenPeak Technologies
www.greenpeak.com