Wireless sensor networks are becoming ubiquitous and their application areas are widening by the day. Localization algorithms play an important role in enhancing the utility of data collected by enabling sensors to determine the location from which each data packet is obtained. Localization can be done by implementing beacon based algorithms or signature based algorithms. Much of the research work in this area assumes received signal strength indicator (RSSI) as a parameter in their localization algorithms. Since RSSI is the key parameter we assume that it's possible to make an application for Android phones to find Bluetooth devices (not only phones, but any other object with a Bluetooth emitter). The main idea is to make it for golf players who want to find balls in a field. The idea is to implement a FIR filter programmed in Android, as the other parts of the code (Bluetooth API and visual application), to get the best signal avoiding the multipath issues, and once we have the RSSI value of the Bluetooth signal, calculate the distance between both devices.