In this tutorial, you can learn how to use an Arduino UNO board to communicate with the FSC-BT826 Bluetooth module and control a LED over Bluetooth.
In order to test the FSC-BT826 more easier, a FSC-DB004-BT826 board can be used, Figure 1 shows the top view and bottom view of the FSC-DB004-BT826, this board is a 6-pin Bluetooth development board, it consists of a FSC-BT826 Bluetooth module and a FSC-DB004 motherboard. The wireless communication is simple, the smartphone works as Bluetooth Master and FSC-BT826 works as Bluetooth Slave. The FSC-BT826 module is a Bluetooth SPP (Serial Port Profile) module, this demo will use a mobile app to create a SPP connection with the FSC-BT826, then perform SPP data transmission.
The power supply of FSC-DB004-BT826 is 3.6-6V and the logic level of I/O pins is 3.3V. But the logic level output of Arduino board is 5V. In order not to burn the Bluetooth module, a 1K ohm resistor should be inserted in the connection of the Bluetooth module’s RXD and Arduino board’s TXD, as shown in the Figure 2. On the other hand, the Bluetooth module’s TXD and Arduino board’s RXD can be connected directly because the 3.3V signal from the Bluetooth module is enough to be accepted as a high level by the Arduino board.
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