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1) In Android default, the UART0 serial port is only opened. The position of UART0 at 26pin is shown in the figure below. The corresponding device node is/dev/ttys0<br><br>
[[Image:Pi-5-details2-pic40.png]]<br><br>
2) First click the WiringOP icon to open the Wiringop WiringOP App<br><br>
[[Image:Pi-5-details2-pic41.png]]<br><br>
3) The main interface of the WiringOP APP is displayed as shown in the figure below, and then click the '''UART_TEST''' button to open the UART test interface<br><br>