Today, I connected my Arduino Uno board to the Bluetooth module HC-05 in order to communicate with my Android smartphone. The HC-05 Bluetooth module and its siblings are far the most popular and inexpensive Bluetooth module used for RF communications by Arduino as a microcontroller.
Then, the image below show the Bluetooth with offers 4 pin outs. Its for 5V, Ground, RX, and TX that have to connect with the right pins on Arduino Uno board. The advantage of this HC-05 module, is we did not need an additional electronic parts.
The way to connect the Bluetooth nee to identify the 5V and Ground Arduino pins on my Arduino. It is to provide the power source for activating the Bluetooth module. GND is of course connected to the GND of Arduino. Next, connect the Bluetooth module's RX pin to the Arduino's TX pin, then connect the Bluetooth module's TX pin with the Arduino's RX pin. The figure below show the Bluetooth connected.
After connecting the Bluetooth serial module with Arduino,we are able to pair the HC-05 with any Bluetooth enables device. As a password to pair, I am using '1234" as a pairing key. After pairing is successful between the devices, the LED indicator will turn "on", like the picture below:
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