In this second chapter/lesson from Jeremy's book we are guided to understand some of the basics of receiving and sending signals. Along the way we will also make sure that you understand how breadboards are constructed and how we will use them to prototype circuits. We will learn a little bit about how LED's work, why pull up resistors are important, what PWM (pulse width modulation) is, and how to use the helpful objects in a typical Arduino kit.

On the programming front we will learn a little bit more about the structure of Arduino sketches (computer code) and how we can use them to create different behaviors. We will also get you ready to explore using buttons to signal the Arduino to perform some action and deal with the challenges of bouncy buttons.

Here is a summary of the sorts of things you will be exploring between the second and third week in video form.