This paper investigates a discrete events simulation of wireless sensor networks routing protocols. We propose a discrete events simulator called SENSIM (SENsor networks SIMulator). In this simulator, Flooding and Gossiping of linear routing class protocol, PEGASSIS of hierarchical routing class protocol, and MFR of localization based routing class protocol are implemented. The implementation of these protocols is based on a system of a car parking application. Simulation results show that PEGASSIS is the best routing protocol which offered the best network lifetime. Keywords: cooperation, orthogonal protocol, non-orthogonal protocol, space-time coding For further information, please visit this web site.