In this paper, proposed fuzzy based localization method is described in detail. Two different fuzzy systems, i.e. Sugeno and Mamdani, are considered for locating the sensor node, based on the connectivity and RSSI. The results of RSSI are directly taken from the paper \"A new fuzzy based localization error minimization approach with optimized beacon range\". The author first consider Mamdani FIS because it is relatively simple, easy to implement & fits according to the human thought process. Then the author use TSK for the same.