Blind area target aiming system and preference selection training system design

A cyber-physical system (CPS) is a system of leveraging computational elements controlling physical entities that is widely applied in our daily life for all kinds of purpose. It helps us build smart devices and make life become much easier. In this report, two projects were designed to show the idea that how cyber-physical system works in human daily life. The first project is designed for personal security, especially for one of the most dangerous job: security service. It helps user defend his back while he/she is in a tough situation while he or she is alone. First there will be a passive infrared sensor working as a threshold and it also helps make sure the target is a human being. Then a web camera will start to work and take pictures of the user's blind area. A face detection algorithm will be applied to those pictures to locate the position of the target. Finally two servo motors will work together to rotate to a certain degree, pointing the laser pointer to the target's body to show the warning. A prototype is built to show that the idea works. The second project is focused on the mental stress problem in daily life. Based on the fact that proper light and music can help people get relaxed, a system is designed to help people find out the right choices. The system will be trained to learn a user's preferences on the brightness and hues of colors, as well as the speed and emotion tone of the music. A commercial product of galvanic skin response sensor is used to indicate the stress level of the user as the response of the training process.