I'm admittedly new to all of this, but what I want to do seems simple enough. I want to e able to turn a light on when a bluetooth device comes in range.
All that the main unit will need to do is scan for devices periodically, and check the ID/mac address if it detects a device. There should be no need to actually pair with it. All I need it to do is to know that this is my phone and not some other one.
Since I am not actually connecting to the device would a slave module be sufficient?