Millions of landmines still have been buried in various countries around the world. Unfortunately, landmines make the correct detection of humanitarian organizations very difficult. For this purpose, new technologies such as improved sensors, efficient manipulators and mobile robots are needed. Our effort is to develop a small mobile robot for landmine detection. The mobile robot consists of sensor module, GPS, RF communications equipment, IR camera, motors, and controllers, etc. This paper describes the current configuration of development in landmine detecting tracked robot. Specifically we are concerned with the sensor module of the mobile robot. Our results show that graphs have measured a small metal instead of a real landmine because of the big danger of students experiments on detection with real landmines.