No funciona USB

[Juancarlos]

Buenos dias
Al utilizar MIT app inventor configuro e inicializo el puerto serie a 9600 baudios. No consigo que salgan los datos para comunicar con un Arduino UNO por el puerto USB de un movil Xiaomi ni por una tablet Huawei.
Por favor,¿Pueden ayudarme? ¿Qué estoy haciendo mal?
Gracias

[Patryk_F]

Use this extension instead of a built-in component.

Using serial with FTDI

One problem with the built in serial component is that it does not include d2xx.jar needed for communication with FTDI usb to serial converter. If you connect this device you get an error “Java Lang.NoClassDefFoundError: Failed resolution of Lcom/ftdi/j2xx/D2xxManager”. I guess this is from the PhysicaloidLibrary. It is the same problem with the com.pavitra.5.aix that make use of the PhysicaloidLibrary. If this is solved, then some of the Arduino clones can be used with App Inventor. A better …

[ChrisWard]

Hello Juan

What error message do you see? Can we see your App Blocks?

[Juancarlos]

does not give any error. It just doesn't communicate.
But if I use Usbterminal if the communication with Arduino works.

Thank you

[Patryk_F]

Due to the lack of drivers in the built-in Serial USB component, it does not connect to every possible arduino module. As I wrote above, use the extension and the trouble will be gone. Nobody will correct you and help you with the built-in component.