Research And Implementation Of Remote Control For Camera Movement Based On 3G/4G

Remote control of camera movement is of great significance to achieve multi-location,close observing of crops.Controlling the camera move on the traditional truss by wired way,wiring cumbersome and high cost led to the practical application of limited distance,maintenance difficulties and a series of problems.Aiming at this problem,remote control system for camera movement was built based on 3G/4G,achieving remote network by 4G network and OneNET server platform,achieving stepper motor horizontal and vertical movement of remote control based on STM32 control chip,specific research as follows.(1)Constructing a remote control scheme of camera space movement based on 3G/4G network.By the 4G wireless router and OneNET server platform,remote management center and expert port and control site were connected to achieve the remote real-time operation of the local camera.The position information of the camera on the truss could be fed back to the remote ground in real time.(2)Designing the controller to control stepper motor for horizontal and vertical movement.The controller was mainly composed of STM32F407 processor,network interface,drive circuit,position acquisition circuit and storage circuit.Network interface used W5200 module to implement the physical layer,the data link layer and the TCP/IP protocol,and provided the Socket data packet for the processor.The STM32F407 received the data packet through the SPI serial port,analyzed the control command and generated the corresponding control signal.The drive circuit was driven by the control signal to drive the stepper motor to realize the horizontal or vertical movement of the camera.The position acquisition circuit received the feedback signal of the stepper motor and converted it into pulse signal and sent it to the STM32F407 through the I/O port.STM32F407 received the pulse and numbers,identified the camera moving direction,calculated the moving distance and camera position,and sent to the remote through the network interface.The memory circuit used the AT24C02 serial EEPROM to store the received pulse information to prevent loss of information due to controller restart.(3)System performance testing.The movement error analysis of the network camera was carried out,and the presetting arrival position was set to 50.0cm and the presetting vertical position was set to 30.0cm.The movement error of the horizontal movement and the vertical movement in different speed modes was tested respectively.Finally,the horizontal movement speed was 2.0cm/s,vertical movement speed was 1.0cm/s.In this speed mode,the horizontal and vertical motion errors were controlled within 5% and 15%.By adjusting the parameters to improve the performance of network communication,and the flow of consumption was tested.After a large number of experiments,the final time to determine the system timing timer restart time was 30 seconds,the stepper motor controller to obtain the latest data server timing parameters was 5 seconds,W5200 network connection abnormal restart time parameter was 10 seconds,the network camera position feedback time interval parameter was 5 seconds.In this case,the 4G wireless router consumed 3-6 trillion flow per hour.