Abstract:A robot which is capable of odor source localization can be employed in many applications, such as the detection of toxic gas, fire at its early stage and explosives. Fuzzy logic based Small Odor Source Localization Mobile Robot is designed. The robot equipped with gas sensor(TGS 2600 chip), and Arduino Mega 2560 was used as the embedded controller. The concentrations of the source sensed by the gas sensors were used as the inputs of the fuzzy. The output of the Fuzzy logic is used to determine the Pulse Width Modulation(PWM)of driver motors of the robot. The path that the robot should track was depended on the PWM of the right and left motors of the robot. When the concentration in the right side of the robot was higher than the middle and the left side, the fuzzy logic would give decision to the robot to move to the right. In that condition, the left motor was in the high speed condition and the right motor was in slow speed condition. Therefore, the robot would move to the right. Experimental results demonstrate the capability of this simple odor source localization.