Troubleshooting

This is a collection of FAQ-style troubleshooting tips.

If your problem isn't covered here, or you'd like to suggest a new addition, please use the mailing list (linked at left). We do not read the wiki comments.

I am using a custom ROM or older Android build and nothing works.

Stop right there; this project probably isn't for you.

usb-serial-for-android only supports devices which comply with the Android USB Host API. For a partial list of compatible devices, see CompatibleAndroidDevices.

How do I access /dev/ttyUSB0?

You don't; see previous question. /dev/tty* is the Linux kernel's driver interface to various serial devices. Certain devices and custom ROMs may expose serial devices this way, but this library does not use this interface.

I am using an Arduino Uno, Sparkfun Pro Micro, or other Arduino and "if (Serial)" doesn't work.

Some Arduinos use the DTR line to determine serial channel readiness. In your Android code, call setDTR(true);