IOIO (pronounced YoYo) is an input/output board for Android phones and tablets. It allows you to attach electronic devices to your Android phone using the USB connection. If you have a IOIO with the latest firmware, you can also communicate over Bluetooth if you attach a Bluetooth adapter to the IOIO.

In this chapter we will look at how to set up your computer and Android phone to use the IOIO and use the sample application that comes with the IOIO software to turn the “status” LED on and off for your phone.