Automatic Variable Rate Fertilizer Control System Based On NiosⅡ

In 20th Century 1990s , a large-scale integration of the FPGA, from the integration of thousands of gates to hundreds of thousands or even millions of gates. Therefore, the possibility of an electronic system integration to FPGA, or SOPC. This design used the most representative of the current IP core ,Altera Nios II embedded processors which use QuartusII6.0 platform control system in accordance with the rational allocation of processor resources.VRF technology is a rather reasonable and advanced technology by its thought of technology. But it is rather difficult to spread this technology all over our country. Actualizing VRF technology should adjust measures to local conditions and adapt to current situation of our country's development. Take located fertilization by GPS, there will be too much early devotion and the operation is complex. So it is incapable to realize in short time under the economic and civilization level of farmers in our country. Therefore the thesis brings forward a study scheme on control system of automatic variable rate fertilizer based on NiosII processor which is located with location sensor instead of GPS with the method of calculation the positioning.There are two main research parts in this thesis:(1)Automatic control system of variable rate fertilization establish specific research are as follows :①Components of the control system and the process control system and theworking principle.②Described NiosII processor configuration process.③Set out in clear detail the various parts of the principle of variable rate fertilizer applicator and hardware circuit. for the implementation of variable-rate technology to provide a reliable, comprehensive hardware platform.(2) sets out the principle of variable rate fertilizer applicator control collate test data and conclusions Making located experiment and comparative research with near switch, optical encode and Radar II Ground Speed Sensor on soil ground. Finally choosing the scheme of using near switch in conjunction with other sensors to determine absolute positioning instead of GPS to locate and provide academic reference for location of fertilizable machine.