In this paper, we talk about Sensor Networks,their different applications and problems encountered, precisely the routing problem which constitutes a major constraint in this type of networks. To address some of the limitations, a new protocol,called Energy Based Protocol (EBP), was proposed. EBP operates under different scenarios and showed, after its simulation using TinyOS, many advantages in terms of load balancing, free looping, minimizing packet error rate and maximizing network lifetime. EBP could be implemented in different applications: hospital surveillance, forest monitoring, etc