Design Of Electric Pan/tilt/zoom Controller Based On Microcomputer AVR

In recent years, the development of video surveillance is rapid, the range of applications become wide. In order to expand the scope of monitoring and improve the monitoring of vision, the pan/tilt/zoom (PTZ) can be used, which means to put a camera on a PTZ and to control the PTZ camera rotating. At the same time, the parameters of the camera lens can be controlled. The PTZ play a key role in the monitoring system, it reflects the performance of monitoring system. For instance, in the high-risk occasions, it usually uses a high security level of explosion-proof PTZ.In this paper, a controller for electric PTZ, which is based on microcomputer AVR and applied in explosion-proof PTZ system, has been designed. It can receive commands from the controller, which control the PTZ motion, the camera, NEAR/FAR, TELE/WIDE, Close/Open. The parameters of the camera can be saved in memory.First of all, the background of the subject, the classification of PTZ and the development of PTZ Controller are introduced. The functions of PTZ are analyzed. A program for these functions is proposed. Secondly, the entire process in detail from hardware to software is described. The specific hardware on the circuit functions of each module PTZ is gave and analyzed. In the process of software design, the basic concepts of serial communication and the PELCO-D protocol are introduced. The main software programs and subroutine are finished. Finally, the reliability design about the hardware and software are described.Through the actual running of the system, it is proofed that the system runs stable. The PTZ rotating and the parameters of the camera lens and Preset function can be controlled. The goal of the expected is achieved. At present, the design has been used in practical PTZ system; the operation has a good effect.