Build compelling USB and Bluetooth Accessories to extend the capabilities of your user's Android-powered devices. Android defines an standard protocol that you can implement in your accessories and have it compatible with a wide range of Android-powered devices.
Android 4.1 and higher has support for audio output over a USB connection or Bluetooth. Find out how to build audio docks and other plug-in audio output hardware for Android.
What do you want to connect to your Android device? Alarm clock? Keyboard? Thermostat? Robot? Learn how to connect existing equipment or your own unique hardware to Android.