Double-Motor Two-Dimensional Positioning System Controlled By MCU

In our daily life we often see the following scene: one objective is always tailed after by a camera somewhere nearby the objective, and when the objective moves, the camera must move, when the objective stops, then the camera stops. Anyhow, the camera is always aimed at the objective, namely the camera is running after the objective. This is what is so called the Two-dimensional Positioning System, which is introduced in this paper.In this paper, the so-called Two-dimensional Positioning System is such a system as that there is a motor both in the level and vertical orientation respectively. The camera is derived and controlled completely by the motors. And so, given by the proper control signal of the motor, the camera can change its position to achieve the goal of positioning.DC permanent-magnet motor is elected as the executive appliance in this paper's design, of which motor X is used to control the level orientation, and motor Y the vertical orientation of the camera to form the Two-dimensional Positioning System. The whole system is composed of three parts, which are respectively the given part, the controlled part and the executive part. The given value is some data of the target's location coming from the image processor. Taking the MCU ATmega8 as the core control element, the controlled part consists of the secondary circuit of the MCU, the main drive circuit of the motor, and the location's feedback circuit, meanwhile, in the interest of achieving best positioning purpose, the software is also added to the controlled part. The executive part is mainly composed of motor, which driving the camera moving. The data from the image processor is sent into ATmega8, which is one element of the control part and can transform these data into corresponding control signal that will be sent to the next main drive circuit, which consists of switch components and also decides which of the two should run and their forward-backward running. After the motor accomplishes its start-up, for the pinpoint goal, a self-made photoelectric disk and plastic circuit are used to form the feedback portion, which can send real-timely the feedback signal that shows the distance the motor has moved to the MCU. The MCU then decides the moment when its output should be stopped by compare the given with the feedback value, and by doing so, the camera droved by the motor stop at the objective location by rule and line. Meanwhile, the disposal of the data that need the MCU to deal with is implemented via software programmer, and this is the idea of integrated control by integrating hardware with software.