November 9, 2005—EnOcean, a global pioneer in energy-harvesting wireless technologies, announces the introduction of the STM250 solar-powered radio frequency (RF) magnet-contact sensor. The new sensor, explains EnOcean, eliminates the principal deficiency of wireless security systems: namely, the dependence upon batteries. By doing away with the burdens of battery monitoring and replacement, the new magnet contact can operate virtually forever without costly maintenance.
STM250 is not dependent on expensive Lithium ion batteries, the company says. It requires only ambient indoor or outdoor light. The amount of light typically available in offices or homes is sufficient to both operate STM250 continuously while storing energy for up to six days use in total darkness.
STM250 assures dependable communication, explains EnOcean. Its suite of RF protocols includes multiple broadcasts, fast data rates, error detection, and unique addressing. It automatically transmits its signal immediately when the contact is opened/closed. A periodic presence signal is sent on the quarter-hour to indicate that the node is operating properly, using stored energy.
The device—smaller than a standard doorbell—consists of a solar cell energy generator; an energy reservoir; a reed contact switch; a microprocessor for sensor control; a radio transmitter and antenna. A separate magnet is provided.
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