Design Of The Control System Of Mixed Fertilizer Applicator

Precision agriculture is a specific way to achieve sustainable development in agriculture. Precision agriculture absorb multidisciplinary advanced technologies to serve farmers. In the course of agricultural production, it helps to achieve an automated and intelligent system. At the same time, precision agriculture, from a macro point of view, grasps the basic information of the entire farm. While from microscopic point of view, it changes the traditional agriculture of the extensive operation mode. In the field from planting, fertilizing, irrigation and use of pesticides in precisely and controlled way, precision agriculture can do just the right job. China is in need of a control system for precision agriculture to reduce westage of fertilizer, to reduce agricultural input and to help to improve the farmers’ income; while it can avoid the damage caused by excessive fertilizer on the environment. Furthermore, due to the need of fertilizer as a huge mineral resources, so by reducing the amount of fertilizer, earths scarce resource can be protected. The main theme of this paper is the precision agriculture as an important part of the development of a mixed variable rate fertilization control system based on ARM S3C2440.The main work of mixed variable rate fertilization system design and development process is as follows.1. By comparing the domestic and international existing variable rate fertilizer development and its advantages and disadvantages of the different control methods they used, it is overall designed that viable mixed variable rate fertilization control system.2. Mechanical platform consists mainly of nitrogen fertilizer tank, phosphate fertilizer tank and potash fertilizer tank While fertilizer tank and the outer sheave of fertilizer and other components are installed with the final uniform fixed bench.3. Electrical part is include the hardware design and software debugging. This is the core of the entire mixed variable rate fertilization control system. The Electrical module consists of the following components; the field computer module, communication module, motor control module, speed module, human-computer interaction module and power supply module. Designed and debugged individually, the above modules form an organic coordination control system. This control system has high performance, stability and precision.4. The integration of the mechanical platform and the electrical control part into one, is to complete the entire test bench device, and to select the crystal, solid and powdered fertilizer. A lot of static experiments are carried out and ultimately a relationship is established by the matlab.5. Mixed variable rate fertilization sheave control mathematical model is developed. It is also pointed out that their system can continue in-depth study of the directions and recommendations.The entire workflow of the system as follow. Firstly, build the CN network of three nodes, and pre-store it in the small area fields required amount of fertilizer to the SD card node, then the field computer core node read a small area from the SD node through the CAN bus. Then by using the established sheave control model, the microcontroller control three DC motor by using the PWM waveform. After that three motor control N, P, K a fertilizer, eventually applied by sprinkler system. Because of creating model accuracy and stability of the entire system, the final accuracy of mixed variable rate fertilization system is less than5%. The coefficient of variation of less than13%Two indicators fully meet the national standard for fertilization machinery. The whole system can be ported to agricultural machinery mixed variable rate fertilization device.