ZigBee vs. Bluetooth.

ZigBee is broadly categorized as a low rate WPAN, and its closest technology is Bluetooth.  A good bit of energy has been spent in analyzing whether ZigBee and Bluetooth are complementary or competing technologies, but after a quick look at the two, it can be seen that they fall a lot farther down the complementary side of the spectrum.  They are two different technologies with very different areas of application and different means of designing for those applications.  While ZigBee is focused on control and automation, Bluetooth is focused on connectivity between laptops, PDA’s, and the like, as well as more general cable replacement.  ZigBee uses low data rate, low power consumption, and works with small packet devices; Bluetooth uses a higher data rate, higher power consumption, and works with large packet devices.  ZigBee networks can support a larger number of devices and a longer range between devices than Bluetooth. 

                                            Because of these differences, the technologies are not only geared   toward different applications, they don't have the capability to extend out to other applications.  As an example, for its applications, Bluetooth must rely on fairly frequent battery recharging, while the whole goal of ZigBee is for a user to be able to put a couple of batteries in the devices and forget about them for months to years.  In timing critical applications, ZigBee is designed to respond quickly, while Bluetooth takes much longer and could be detrimental to the application.  Thus, a user could easily use both technologies as a wireless solution in a PAN to suit all types of applications within that network.

In recent years, the advances in wireless communication and electronics have accelerated to develop many wireless network solutions to replace existing wired networks. A wireless network solution can support mobility and flexibility of nodes in a network. Especially in sensor networks, it has many advantages to replace cables with wireless logical links. On the other hand, RF transceiver 2.4 GHz is generally considered as a promising short-range wireless technology because of its inexpensive cost, low power and small size, and thus RF communication has been gaining increasing interest from various industries. For the above reasons, we adopt RF technology for a wireless sensor network, which is designed for security systems. When key is pressed to control the specific device, the control signal sends through RF transmission. In the receiver side the received signal is signal conditioned and gives it to the controller. The specific signal conditioned data is compared with the predefined data, and confirm the data, then the controller generates the control signal to control signal. The signal will control that specific device through relay unit , meanwhile the status of the device will be transmitted to control unit through same RF communication. 


This project is implemented usingRF Transceiver, PIC micro-controller, driver unit for control load.

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Wed, 22/06/2011 - 12:04