Let's summarize what we did in this chapter of the book. We built a very simple Arduino project comprising an Arduino board, a relay module, and a temperature and humidity sensor. We saw how to connect these components together so that we can control the relay as an output and read data from the sensor. We also saw the basics of the aREST library, which we will use in the whole book to control the Arduino board from an Android device.

On the Android side, we have prepared our IDE and Android device for development, which will prepare us for the upcoming projects that we have prepared for you in this book and help us have a seamless experience. We also had the opportunity to compile our first app and get it up and running on our Android device.

At this stage, you can already repeat the steps we took in this chapter to really get familiar with the Arduino IDE, the commands of the aREST library, and the Android development environment. We will use these tools extensively in the rest of this book; so, it is crucial that are you familiar with them.