You have reached chapter 3. Here we will look deeper into the realm of sensors. You will learn a lot in this chapter about using a touch sensor to create cool projects. You will be introduced to Arduino's sister software (technically its father). Processing, which is often used along with the Arduino to either create an interface to communicate with the Arduino, or simply to display data in a much more comprehensible way.

This chapter is divided into three sections. We will start by learning the basics of Processing. Then we will use the number touch pad and the processing software to create a tic-tac-toe (X's & O's) game. And, in the final section, we will use the touch pad to recognize stroke patterns and different alphabets and display them on the screen.

This chapter uses less hardware; however it involves a lot of programming, so you should be ready for that.

In this chapter, we'll cover the following topics: