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Bluetooth hc - 05 to android connection problem

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Briez

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I had made a circuit which contain relay to power on 12v device, was interfaced by a microcontroller.

It was working fine before 5 days. I mean I was communicating with bluetooth module by an android software ited debugging studio. And then bluetooth was being connected by any other android devices but today when I wanted to connect it I received an error unable to connect. None of any mobile can connect with it. I tried by rebooting it but couldn't connect.

What can be the problem? I am facing same problem with another hardware too..
 

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