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I have an HC-06 Bluetooth module connected to an Arduino UNO board to allow for the data received by the Ultrasonic sensor to be transferred to my PC via bluetooth and serial communication. I am using the Putty program to view the data. The thing is, my PC says that it has paired with the bluetooth and I was able to see the COM number but when I opened Putty and entered the COM number while choosing the option 'serial' an error box appears saying: Unable to open serial port.

The way I am currently connecting my bluetooth to the arduino board is:

RX->pin 10

TX->pin 11

GND->GND pin

VCC-> 5V VCC

I am sure that the sketch in the arduino for serial communication via bluetooth is right as I have tested the system yesterday and it worked. Only after a time (say like 5-10 min) the connection breaks and I cant seem to figure out the problem. Oh and the Arduino is being powered by USB if that matters.

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If you have powered the BT module from 5v you may have fried it, I recall that the hc-06 module is 3.3v and 3.3v signal too.

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    The HC-06 vcc needs minimum power 3.6 to 6V, but it's the rx, tx pins that need 3.3 v output from the arduino
    – Ghadeer Aiydhah
    Mar 17 '16 at 14:50

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