The Bluetooth module used in this design is version 4.0. At present, there are many Bluetooth modules in the market, and the price is more than 10, which is relatively cheap. Therefore, the finished module design is directly used. The Bluetooth module and the single-chip microcomputer are cross connected, and TXD is connected in the way of RXD. The schematic diagram of serial port connection is shown in Figure 2.8<br>
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