Doorbells are an essential part of the security systems around the globe. We cannot ignore the importance of doorbells in our daily life. Doorbells are now found pretty much everywhere, be it our homes, our offices or any other building. Doorbells are being used everywhere. It is true that over the time, our traditional doorbells have become smarter and better. Now they are not limited to being a doorbell, they have emerged. The doorbells now have developed as a security system, capable of protecting any building, on its own. This became a reality only because of...