The level shifting/conversion can be achieved either by use of a voltage divider or a level shifter module (like we did in this tutorial). The HC06 Bluetooth module is a 3.3v logic level based device and thus if directly connected to the Arduino, will sometimes be unable to process the message received from the Arduino which is a 5v Level logic level device unless there exists some form of level shifting, although the Arduino can easily understand the data being sent from the Bluetooth module since it uses a higher logic level. It has 4 pins and communicates with a microcontroller via serial interface. The HC06 Bluetooth Module is a slave only version of the HC05 Bluetooth module. We will be using the HC06 Bluetooth module as the major ingredient in this tutorial. For simplicity, the goal of the project is to switch a LED connected to the Arduino using the mobile app.
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