Cannot assign COM port to HC-05 bluetooth device

Question

I can't set a COM port to my paired BT module. For better understanding I recorded a YouTube video to make sure I show everything.

Hardware:

• Arduino Nano knock-off by RobotDyn (atmega168)
• Bluetooth module HC-05 (zs-040) which looks like this
• Windows 10 Home 64 bit on tablet

I have wired them up like this .

However, before that, I tried to wire it up without the resistors (so I hope I didn't damage anything).

Here is my very simple code which should just echo back what it get.

void setup() {
 Serial.begin(9600);
}
void loop() {
 if(Serial.available())
 {
 Serial.println(Serial.parseInt());
 }
 delay(100);
}

• duck: Hi Tomas, can you add details about your Windows? what version is it? and version of bluetooth adapter
• TomasB: @dpw I have Windows 10 Home 64 bit. It's a tablet and the BT adapter for the tablet is build in so I don't know any additional information about it.
• Harry: I have exact the same problem. Expect also to see a com port number after my device a MLT-B05 (clone of HC-05) is paired and (after fill in correct pass-code) is connected. Did you see a you tube film for a correct assignment of the com port? I did everything the same as you did, but perhaps we are both wrong. Harry

Answer 1

Based on my experience, there is nothing wrong (yet) on the Arduino. You can check this or this. Unlike previous windows version, Win 10 tend to "ignore" bluetooth connection, so you have to assign the COM port manually.

• TomasB: That's exactly what I did. However when I want to assign the COM port I have no device to choose from even though I can see it paired in the main BT window.
• TomasB: link Here is screenshot of the problem.
• duck: Ah, the same problem also occur to me. I don't know if there are any solution other than mine, which solved by using external bluetooth dongle. Turns out my build-in bluetooth adapter is not compatible with the bluetooth module (which is HC-05 and HC-06).
• TomasB: Well but my mobile phone also cannot communicate with the module. It seems to me pretty odd that the built-in BT cannot communicate with other BT devices.