Bluetooth networking standards will transmit data via low power radio frequency. Bluetooth communicates on a 2.45 GHz frequency. For the use of industrial and medical devices, the frequency band has been set by international agreement.
Many devices take advantage of this frequency band. Some of devices which use this frequency within the ISM band are garage door openers, baby monitors, and the next generation of mobile phones. Ensuring that Bluetooth and the other devices don’t interfere with each other is an important part of the design process.
One of the ways is Bluetooth will sending out weak signals around 1 mw. In other hand, most cell phones powerful can transmit a signal of 3 watts.
The low power signals will limit the Bluetooth range device around to 32 feet, which cut the interference chances between your computer and other electronic devices. Bluetooth doesn’t require a line of sight between the communicating devices, although it has low power. The walls in home won’t stop the signal.
Bluetooth can connect 8 devices at the same time. The devices should on the same radius, you may think they would interfere with each other, although it’s very unbelievable. Bluetooth utilizes a technique known as low frequency hopping, which makes it harder for more than one device to transmit on the same frequency at the same time.
With this technique, a device will use 79 individual, randomly chosen frequencies within a designated range, which change from one another on a regular basis.
In Bluetooth case, the transmitters will change frequency 1,600 times or more every second, means that more devices can make full use of the spectrum of the radio. Since every Bluetooth transmitter will use spread spectrum automatically, it’s very unbelievable that two transmitters on the same frequency and at the exact same time.
When the Bluetooth devices come within close range of each other, an electronic conversation will occur to determine whether or not they have data to share or whether one needs to take total control. The user doesn’t need any buttons to press or commands to give – as the conversation will occur automatically.
While the conversation has occurred, the devices will form a network. Bluetooth devices will create a PAN (Personal Area Network) or Pico net that may fill a room. The devices will randomly hop in frequencies, when the Pico net has been established.
