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 appeared saying: "Unable to open serial port."

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

RX->pin 10
TX->pin 11
GND->GND pin

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 can't seem to figure out the problem. The Arduino is being powered by USB, if that matters.

  • 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.
    – Hans Neve
    Mar 17, 2016 at 7:19
  • 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 Mar 17, 2016 at 14:50


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