Bluetooth HC-06 Hello world
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Hello,
I got this Bluetooth from ebay. It is cheap and easy to config. You will need to connect the second USB for power. I used a phone charger to power the board ( FRDM-KL25Z ).
Config your Bluetooth with your computer first.
check the following links for help http://projectsfromtech.blogspot.com/2013/06/arduino-bluetooth-with-hc-06-and-jy-mcu.html https://mbed.org/users/edodm85/notebook/HC-05-bluetooth/