Thank you Nick... I used your code
{
Serial.begin(9600); //note this may need to be changed to match your module
Serial.println("OK then, you first, say something.....");
Serial.println("Go on, type something in the space above and hit Send,");
Serial.println("or just hit the Enter key");
}
void loop()
{
while(Serial.available()==0)
{}
Serial.println("");
Serial.println("I heard you say:");
while(Serial.available()>0)
{
Serial.write(Serial.read());// note it is Serial.WRITE
}
Serial.println("");
}
and I compared the usb serial and bluetooth result. These results shown in the pictures below,
...the problem is occurred when comparing with usb and bluetooth.
I think it about bluetooth interface. Then I re-install both arduino uno and HC-05 and problem occur again.
I don't know why.
