Integration of algorithms and protocols from different layers will make possible the deployment of large-scale wireless sensor networks which are the basis of interesting monitoring applications. The growing number of nodes that comprise within these networks requires a correct organization and efficient node synchronization to ensure data reliability. In this study, we focus on the integration of fuzzy-logic based routing with a TDMA MAC protocol. By considering the experimental results of them working separately, we have integrated them to work together. The use of a rapid configuration and efficient slot assignment from the MAC protocol, and the accuracy of the logical tree created using fuzzy logic, allows to have a network in which nodes are both organized and synchronized, while load balance extends network lifetime. © 2011 Springer-Verlag Berlin Heidelberg.