Posts Tagged ‘zigbee wireless hardware’

Wireless Arduino programming with ZigBee

Thursday, November 13th, 2008

xbee.jpg

ZigBee is a low-power communication system using digital radios. It’s intended to be easier to work with than Bluetooth. Adafruit recently added an adapter board for Digi’s XBee product line and has put together a great how-to to show the devices potential. Using two XBee radios and adapters you can wirelessly program an Arduino board. This would be great if your Arduino was installed in an inaccessible area or maybe it’s over 100feet away from where you’re working. The radios do serial communication just fine. What the how-to covers is getting the reset line working so the Arduino can restart automatically after you program it. Once the radio pair is configured properly, it will pass the RTS line state directly from one device to the other.

Source: Hack a day

Differences Between Zigbee 2006 and Zigbee 2007

Wednesday, July 9th, 2008

The Zigbee spec started out in 2004 and that was known as the original Zigbee spec or Zigbee 2004. In 2006, they revamped the spec based on the feedback they got and that version ended up being called Zigbee 2006. In late 2007, they announced Zigbee Pro which most people think of as Zigbee 2007. However they actually created two versions of the spec. One of them is Zigbee 2007 and one of them is Zigbee Pro. The Zigbee 2007 update didn’t get a lot of press coverage so most people didn’t even know that they updated the Zigbee 2006 spec.

There were actually many changes from Zigbee 2006 to Zigbee 2007 and unfortunately, they weren’t clearly documented in the public version the spec. In fact, there is only one Zigbee spec which includes Zigbee and Zigbee Pro. To understand which features belong to Zigbee and which belong to Zigbee Pro, you have to turn to the feature set definitions documents.

I don’t really want to get into the differences between Zigbee and Zigbee Pro right now, but I thought I’d highlight some of the major differences between Zigbee 2006 and 2007. Also, I’ll complain a bit about how there is no changelist so we need to find a lot of the spec changes ourselves. Two of the main features that changed between Zigbee 2006 and 2007 is the addition of fragmentation and frequency agility. Fragmentation is the ability to handle data transfers that are larger than the maximum payload size that a frame can handle. An example would be to transfer 10 kB of data when the max frame payload size is much less than this. In order to transfer such a large chunk of data, you previously had to break it up into chunks in the application and send it via Zigbee. With fragmentation, the spec gives instructions on how to transfer such a large amount of data in a standardized way. It’s pretty similar to the way TCP handles fragmentation, ie: windowing and counters. This feature is optional in Zigbee 2007. (more…)

Radiocrafts Rolls Out Compact ZigBee Network Module

Sunday, July 6th, 2008

Radiocrafts AS, a leading provider of compact RF modules, now expand their product line with a compact ZigBee Network Module (ZNM) for use in ZigBee based mesh networks. The ZNM module offers the complete ZigBee network protocol in a small module with an easy to use API interface. By using the new ZNM module, ZigBee applications can be built with minimum effort, reducing time to market.

The RC2300-ZNM module is a compact surface-mounted high performance module measuring only 12.7 x 25.4 x 2.5 mm including EMC shielding and integrated antenna. The module is delivered on tape and reel for volume production.

The module is very easy to use having a UART or SPI interface for serial communication and configuration. The ZigBee application runs in any external controller, communicating with the module by an easy-to-use API. With only 10 API calls, a complete application can be made. The new module supports all features of the ZigBee 2006 standard.

The RC2300-ZNM module is pre-certified for operation under the European, FCC and ARIB radio regulations for license-free use. It operates at 16 channels in the 2.45 GHz frequency band. When used with quarter-wave antennas a line-of-sight range of 250 meter can be achieved. Indoor range is typically 10 – 30 meter. The module is designed for use in battery operated systems using sleep mode with less than 1 uA.

Source: EDA Geek