Modules get wireless onto less-crowded frequencies

EnOcean has released 315MHz versions of its ultra-low power radio modules.

The development enables integrators to install wireless sensors networks into buildings using a frequency band that is far less crowded than the others available - such as 2.4GHz.

Jim O'Callaghan, EnOcean's President of North American operations, said: 'The development concept was simple, low-power devices, such as thermostats and occupancy sensors, should not share air waves with higher-power devices such as WiFi routers, ZigBee coordinators and microwave ovens.

'For building automation, the 315MHz frequency inherently provides range and performance advantages over the higher 900 MHz and 2.4GHz frequencies.' Laws of physics dictate that the 315MHz frequency band is able to carry data through materials, such as building walls, more efficiently than the higher 900MHz and 2.4GHz frequencies.

When other range variables are held equal, 315MHz RF modules yield longer indoor range (up to 4x the range of 2.4GHz data communications).

Additionally, FCC regulations limit power output, radio packet length and data steaming when communicating using the 315MHz band.

These regulations have a desirable effect on building control networks since the three factors translate into less potential for data collisions in the air.

The 315MHz radio modules, when coupled with EnOcean's patented energy harvesters, free integrators from the constraints of wires and batteries.

The radio modules and energy harvesters convert traditional controls into 'peel-and-stick' sensors and switches.

The resulting controls simplify installations and provide automation systems the data needed for controlling lights, blinds and heating/cooling units.

In building retrofit projects, the self-powered wireless controls keep installers out of the walls, expedite installations, consume less copper and allow building owners to remain open for business during installations.

Automated control systems inject energy efficiencies into energy-inefficient buildings.

Occupancy-based systems, for example, reduce the amount of energy wasted heating, cooling and lighting unoccupied rooms.

Demand-response systems allow utilities to avoid brown and black-outs.

Master on/off controls simplify compliance to government regulations such as California Title 24.

Self-powered wireless sensors and switches simplify the installation of all the aforementioned systems.

The 315MHz radio modules are available in a development kit that also features EnOcean's energy-harvesting technologies.

Integrators can get their hands on the radio modules, a pair of energy harvesters (solar and mechanically powered) and other components that allow them to explore sensor networking options that do not rely on line or battery power.

Back to top