Let's summarize what we learned in this chapter. We connected a BLE module to Arduino as well as a simple red LED that we controlled remotely. After this, we wrote a sketch that enabled the Arduino board to receive commands via the Bluetooth module.

On the Android side, we took the opportunity to take an existing project, analyze it, modify it, and run the final application on our physical Android device.

In the next chapter, we will build a wireless weather station using what we just learnt in this chapter. We will connect several sensors to an Arduino board, and read data coming from these sensors using an Android app communicating with the Arduino board via Bluetooth.