user15216: I am designing a home automation project. I want to control different home appliances through GSM. I am designing it in such a way that each apparatus is connected to an Arduino and bluetooth module. There is a master unit with Arduino, Bluetooth and GSM modules. When the user sends a message, the GSM receives it and communicates via Bluetooth to the corresponding Bluetooth module and Arduino.
Is it possible to communicate between two Bluetooth modules of two Arduinos? Is there a better solution?

user13456: I'm not sure how many bluetooth devices can be connected to your smartphone. But if you use smartphone, the you can eliminate the master Arduino. But as I said, it still depends on the number of devices you'd like to control. This is supposed to go in the comment section.

user4131: How about little smart WiFi boards (such as Red Bear WiFi Micro or something similar), which are connected at your local home network? You can configure your own dyndns service or use a existing and built a web home appliances or web service for your own mobile application. In general please take care of security aspects, so that your home can not be manipulated...   

15216: <p>I am designing a home automation project. I want to control different home appliances through GSM. I am designing it in such a way that each apparatus is connected to an Arduino and bluetooth module. There is a master unit with Arduino, Bluetooth and GSM modules. When the user sends a message, the GSM receives it and communicates via Bluetooth to the corresponding Bluetooth module and Arduino.</p>

<p>Is it possible to communicate between two Bluetooth modules of two Arduinos? Is there a better solution?</p>
 13456: <p>I'm not sure how many bluetooth devices can be connected to your smartphone. But if you use smartphone, the you can eliminate the master Arduino. But as I said, it still depends on the number of devices you'd like to control. This is supposed to go in the comment section.</p>
 4131: <p>How about little smart WiFi boards (such as <a href="http://redbear.cc/wifi-micro/" rel="nofollow">Red Bear WiFi Micro</a> or something similar), which are connected at your local home network? You can configure your own dyndns service or use a existing and built a web home appliances or web service for your own mobile application. In general please take care of security aspects, so that your home can not be manipulated...   </p>
