As the human life goes on improving, there arise many security issues which sometimes are life risky also. Hence, there comes the need for the security system. As the earlier security system was based on the human inspections that create the faults in the securities.  Hence there come to the security systems based on the various controllers, latest techniques, etc. but, still the optimum security is not achieved.  Thus, the new eras of the face detection security system arise and all the way new technique of security comes.  Even though face detection is a difficult task to make but still the advancing image processing algorithms makes it look so simple. The various image processing algorithms are HAAR, PCA, Eigen Face, Viola-Jones, etc. which have their own limitations. Hence, there comes the advanced algorithms and hence for achieving the optimum security and higher efficiency, we come with the advance PCA based security system.  This algorithm can be compatible with the automation instrument. The automation instruments are of various types such as a microcontroller, Arduino, raspberry pi, etc. thus for the best result along with the cost-effectiveness, we are using the raspberry pi as a controlling instrument. This instrument provides the ability of the storage in the form of database. Thus, database helps to detect the face and allow the recognized person only. Thus this will helps to improve the security.  Thus, this paper consists of the report of working comparison of the various face detection projects based on the raspberry pi module with our project.