In the previous few chapters, you have learned a lot about sensors—what they do and how they work. The number of sensors on this planet is simply out of bonds. It's ever increasing, and while you are reading this book, there could be some new sensor being launched by some country across the world. This might make you wonder, do you have to learn about all of these sensors coming out on the market every single day? 

Thankfully, as you have learned, these sensors are more or less similar and work on a limited set of protocols. This makes working with new sensors easy. You might think that we have covered most of our basic sensors. However, that wouldn't be true—as we are yet to learn one of the most important sensors when it comes to the balancing of robots. These are accelerometers and gyroscope. These two sensors are not only present in all of these robots that have anything to do with balancing, but they have also found their way into our mobile devices. So, now let's learn about the basics of these sensors.