A prototype of GPS based Android controlled projectile launcher

This paper presents a prototype of projectile launcher based on GPS which is controlled by android. Projectile launcher involves the launching of an object at a specified point in the area of range of system. North identification can be accomplished using a sensor known as reed switch. The coordinates of targets and that of the system are obtained from the GPS of the system or through android application installed in cellular phone. The azimuth angle is controlled by the stepper motor while the elevation angle is set by the linear actuator attached with the system. Object is thrown at the target with the help of compressed air. To insure the security of system, a login activity is added so that access of any unauthorized person can be denied.