Depending on the type of Bluetooth (BT) module being used, sometimes it is required to change the default settings of the board, like baud rate from 9600 to 115200 for Quadcopter, or master/slave role of the module. This guide shows how to configure these boards enter AT command mode of HC05/HC-06 bluetooth module with the help of USB to TTL converter. Alternatively for HC-05, you can use an Arduino board in the absence of USB-TTl Converter.

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