bluetooth over sensors

hi' i'm new on bluetooth technology and seeking help to make my idea..
i'm planning to create a security system using a sensor and alarms by using bluetooth the plan is use the sensor as primary input.. when it detects is will send data using bluetooth reciever to triger an alarm or light.. see attachment for diagram.. any help is appreciated.. thanks..

is this posible or not?

Why Bluetooth? 433Mhz transmitter/receiver would be easier to work with and you would get far better range.

bluetooth has more functionality.. you can manage to access the main device by using phones..

It is possible, a bluetooth device is generally "spoken" to using serial (UART/ 232), and you will need to take care of the pairing of the devices, you should first select some bluetooth modules you wish to use and study the datasheet for such operations.

Wilksey

so this can be done on stand alone? i mean without using the computer as main host for each input..
and what type of bluetooth is good for this?

Hi circiro, I got your PM, but if we keep the questions to the forums it helps others who may have issues with this kind of thing also.

A quick search on the internet gave me this:


As the website describes it is serial comms without the cables.

You will need to disconnect from one device before connecting to the next one, which works the same as "polling" sensors.

Actually, the above statement isn't strictly true, you can "connect" to multiple devices, but only use one at a time and will have to toggle between them, and in some cases if you are using the SPP (Serial Port Protocol) mode you can in theory talk to more than device one at a time, it all depends on the modules.

I have only used a one to one on bluetooth, not one to many, you would really need to do some Research and Development with this!

Wilksey

I've search lot of forums regarding this but all the projects made have a host.. like computer, pda, cellphone etc.. can't find guides how to connect them by just using the receiver as host..yeah i gues lot of reading.. but thanks.. =)

The bluetooth modules are generally trancievers, so you set one up as host and one up as slave.
Wilksey