Hi
I bought HC-06 Module and supplied 3.3V to power it..the LED is flashing as mentioned in the datasheet.. but neither my Android nor main laptop is recognizing BT module...plz guide me.
Now that is strange, have you already paired once, or is the module out of the box?
Does it respond to at command on the serial port? If so try to name it, maybe the name field has been left empty, that would be strange but..,
Frédéric_Plante:
Now that is strange, have you already paired once, or is the module out of the box?
It is first time after purchasing module.
Frédéric_Plante:
Does it respond to at command on the serial port? If so try to name it, maybe the name field has been left empty, that would be strange but..,
I think if the name field is empty then it must at least show its address with SENA BT Terminal on my android..
I have the bare device without JY-MCU board. I am using my own level shifter with arduino, uploaded sketch to my UNO and tried to send AT command but no response 
muneeb56:
I have the bare device without JY-MCU board. I am using my own level shifter with arduino
Probably a bad idea. I submit there are are only two possibilities - either the module has been destroyed, or it is just badly connected. All you need is properly applied power for the device to be discoverable. You don't need any code, you don't even need an Arduino.
and tried to send AT command but no response
probably best to fix the first problem before trying any AT commands.
Thanks Nick. But I mentioned earlier that LED at pin-24 is flashing @2Hz rate as mentioned in the datasheet 'Flashing LED means ready to be paired', and it seems the device is alive. Problem is that none of my device recognizing it.
Ah, I missed that. If you have a flashing LED, by whatever means, you be able to pair.
Having said that, I have had the same problem. I could not get my tablet to pair with an HC-06. My laptop was fine, so I blamed the tablet, particularly when I got a phone, which paired just fine with it. I later found that the tablet worked fine with an HC-05. No explanation......
probably best to fix the first problem before trying any AT commands.
Well ,
AT+E
is a good debugging command to use with all AT commanded device, well to me it is. It at least tell you that the device is responding on the serial port side.
I remind you of the header - "module is not Discoverable". When a module is not discoverable, there is only one priority - make it discoverable. You can send AT commands all night and still land up with nothing you didn't know before the sun set. Further since AT commands have already been sent to no avail, what's to be gleaned has already been gleaned - which is nothing very certain. You don't need an AT command to pair, you don't even need an Arduino, it is done from the other end. Unfortunately, all you actually need of the module is a flashing LED, which is already apparent.
Right now, I believe the only solution is to make sure that pairing is unobtainable with both the laptop and the Android and, if no to both, check the wiring. There really isn't much left, but I understand people have had shorts even when the module is on a backboard.
Actually when the module is not discoverable, the priority is to know if it is working, periode. You don't want to waist days in testing. If it does not reply on the serial port side and radio side, then the module just don't work, and then you go deal with the seller.