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usb-serial-for-android

This is a driver library for communication with Arduinos and other USB serial hardware on Android, using the Android USB Host API available on Android 3.1+.

No root access, ADK, or special kernel drivers are required; all drivers are implemented in Java. You get a raw serial port with read(), write(), and other basic functions for use with your own protocols.

Quick Start

1. Download usb-serial-for-android-v010.jar

2. Copy the jar to your Android project's libs/ directory. (See Android's FAQ for help).

3. Copy device_filter.xml to your project's res/xml/ directory.

4. Configure your AndroidManifest.xml to notify your app when a device is attached (see Android USB Host documentation for help).

<activity
    android:name="..."
    ...>
  <intent-filter>
    <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
  </intent-filter>
  <meta-data
      android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" 
      android:resource="@xml/device_filter" />
</activity>

5. Use it! Example code snippet:

// Get UsbManager from Android.
UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);

// Find the first available driver.
UsbSerialDriver driver = UsbSerialProber.acquire(manager);

if (driver != null) {
  driver.open();
  try {
    driver.setBaudRate(115200);
    
    byte buffer[] = new byte[16];
    int numBytesRead = driver.read(buffer, 1000);
    Log.d(TAG, "Read " + numBytesRead + " bytes.");
  } catch (IOException e) {
    // Deal with error.
  } finally {
    driver.close();
  } 
}

For a more complete example, see the UsbSerialExamples project in git, which is a simple application for reading and showing serial data.

A simple Arduino application is also available which can be used for testing.

Compatible Devices

  • Serial chips: FT232R, CDC/ACM (eg Arduino Uno) and possibly others. See CompatibleSerialDevices
  • Android phones and tablets: Nexus 7, Motorola Xoom, and many others. See CompatibleAndroidDevices.

Author, License, and Copyright

usb-serial-for-android is written and maintained by mike wakerly.

This library is licensed under LGPL Version 2.1. Please see LICENSE.txt for the complete license.

Copyright 2011-2012, Google Inc. All Rights Reserved.

Portions of this library are based on libftdi (http://www.intra2net.com/en/developer/libftdi). Please see FtdiSerialDriver.java for more information.

Help & Discussion

Please join our Google Group, usb-serial-for-android.

Are you using this library? Let us know and we'll add your project to ProjectsUsingUsbSerialForAndroid.