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HC 05 bluetooth module Not Pairing and not Replying to AT commands

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Vishal Kottarathil

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First I thought the HC 01 is damaged. But after some works I got the LED (31) is blinking at a slow rate when 34 is connected to VCC. When 34 is connected to GND/Floating the LED on 31 blinks fast and shows in bluetooth device search in mobile. Sometimes after ~1 minute LED Blinking stops and bluetooth device disappears from search, sometimes it stays longer. When i try to Pair it from mobile(Android) first time i asked to enter PIN and pairing FAILED because of above mentioned disappear problem. After that pairing always fail and ask no PIN.

The module is not responding to AT, commands
 

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