Abstract: Navigation system for an autonomous robot is an area that is undergoing constant development. This paper describes anautonomous robot that is capable of navigating in a real time environment. This can be achieved by obtaining the information about robot’s environment by using sensors and process it. For implementation of obstacle avoidance, Fuzzy Logic approach is used and is implemented using Arduino-Uno board on mobile robot platform with three sets of ultrasonic sensors mounted on it. The Fuzzy Logic approach allows us to use the ultrasonic or infrared sensors that allow fast and cost effective distance measurements with varying uncertainty.