cathode of the DC power, the RXD port is connected to the TXD port on Arduino extended board, TXD port
is connected to RXD port on the board, as shown in Fig.3.2.52.
Note: Since Arduino UNO has only one serial port, the Bluetooth must be disconnected from the serial port
when downloading the program, otherwise the download will fail.
Figure .3.2.51 Wiring Positions of Bluetooth
90
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