Study And Experiment Of Yield Monitor System In Precision Farming

Yield is an important aspect to any crop producer, as it influences a multitude of farming decisions, and it is then used to evaluate the result of those decisions. Yield mapping has become an important part of precision fanning system. It tends to be the first stage in implementing PF.Yield maps are produced by processing data form yield monitor system has a vehicle positioning system integrated with a yield meter as well as a yield recording system. Accordingly a yield monitor system consists of several components. It must have sensors to calculate the amount of the crop it harvested, and a positioning system to determine the machine's location and the area harvested. The system must also include a data storage device for recording the position and yield data.In this paper the Global Positioning System (GPS) was used. The GPS receiver was fitted on the roof of the machine. The working principles were described in the chapter 3.Yield monitor consists of a bin, three load cells and a circuit board. The bin mounted on two load cells to weigh stationary and mobile grain weight, a "reference" load cell with a known mass provides compensation for on-the-go weighing. The circuit board can receive and save data transferred from GPS and three load cells. Microcontroller-AT89C52 is used as microprocessor that is cheaper and easy to be used. The software was programmed with O51 language. O51 not only has advanced languages' character but also has feasibility to manipulate the hardware. The working principles were described in the chapter 4.At last, a yield mapping system must have a data recording system. Data are transferred from EEROM on the circuit board to the micro- computer through serial port. An "Access database" was designed to save and analyze data. The database was programmed with Visual basic 6. 0 which have great advantages on database design. The software designed such functions as recording data, analyzing data, dataenquiry and chart display.A reference load cell was used to reduce unwanted error due to the combine engine vibrations. To reduce nonlinear error due to the amplifier and the A/D circuit, the crop mass data were conditioned using linear interpolating algorithm.Postgraduate: Zang RongChunMajor : Agricultural electrization and automatizationTutor : Prof. Ouyang BinLin...