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Wearable Smart Sensors Blog; July, 2007 Archive; Wearable Smart Sensors Blog
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Last week's Site Update talked about speech over 802.15.4, this week we are introduced to a Video Doorbell using ZigBee. There are also updates in the area of Near Field Communication and Energy Sources. Lastly we have an introduction to Ultra Wide Band over Coax, which you are probably wondering why we bring it up as we deal with Wireless Sensors Networks (WSN) here. I personally had the opportunity to do some hands on work with Freescale's, now defunct, prototype UWB modules, using the XS110 chipset. In our testing of the modules we could not get a signal across a large open room. The problem is that current state of the art in antenna design, design the antennas to operate within a small resonant frequency range, which is exactly what you do NOT want to have with UWB. It is my personal view that others have run into the same issue and hence are now talking about UWB over coax. The Art and Science of Ultrawideband Antennas by Hans Schantz; 2005 by Artch House Publishing may be interest to you.
Tags: energy harvesting • uwb • speech via 802 15 4 • video via zigbee •
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By Bob Paddock at 07/12/07 20:55
Site Update:Added link to Jennic's Adaptive Differential Pulse Code Modulation (ADPCM) voice over IEEE 802.15.4 wireless sensor network (WSN), reference design. Added link to ZigBeeTM "high power" RF design. Added link to NFC host controller. Added link to Vibrations good for harvesting electricity.
Tags: wireless sensor network • wsn • sensor network • ieee 802 15 4 •
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