Hello. I am trying to connect my phone to a HC-05 Bluetooth module that's connected to my Arduino Uno. I have been able to send serial data to it and receive the correct feedback when sending AT commands, and the light on the module is blinking at 2 sec intervals, but I can not get to device to show up as available on my phone, or my friend's phone. Any idea what might be causing this?
gauteab:
the light on the module is blinking at 2 sec intervals, but I can not get to device to show up as available on my phone
If the LED is blinking at that speed, that is the reason why it won't show up on the phone. When Bluetooth is in AT mode, it is not in communication mode. It cannot be in two modes at once, so start over with the LED flashing at 2Hz, which signifies "power on, ready to connect"
Most Instructables are junk, but that one specifically says it is for modifying the defaults, and Bitar does know what he is doing. I'm sure he has another article that addresses communications. You might find the following background notes useful