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The important problem of the research on the technology of fertilization is how to improve the utilization rate of fertilizer, and the variable rate fertilizer applicator will be the future development direction. This paper studies how to use SD card to store the data of variable rate fertilization applicator based on MCU, system hardware and software design solutions. Introduce the file system in SD card. Introduction In recent years, the consumption of chemical fertilizer and the yield of crops in our country are increasing year by year, but the input and output are not appropriate. This has caused serious environmental pollution problems because of the increase of fertilizer application rate and the decrease of utilization efficiency. Therefore, the reasonable application of fertilizer should be the core of the future Recommended Fertilization Technology. [1] Variable fertilization technology is a kind of precision agriculture, it requires according to the differences in soil fertility and crop growth between small scale fields, with different fertilizers. So it can reduce the amount of fertilizer and increase the utilization rate of fertilizer. [2] The spectral analysis of the leaves or groups can effectively estimate the amount of fertilizer needed by the crop. The variable rate fertilizer applicator makes real time analysis of crop spectrum information returned by hyper spectral sensor through microcontroller. Use the stepping motor to adjust the size of the amount of fertilizer to achieve precise fertilization. The storage of fertilization information has become a major problem. In recent years, with the development of storage technology, many large capacity memory cards based on Flash storage technology have been developed. The SD card is widely used in a variety of digital products with its small size, low power consumption advantages. The SD card provides an ideal storage medium for the storage system of precision fertilizer application. In this study, the SD card controller designed was based on C51 MCU. The data were read and written by the serial peripheral protocol bus structure. Design of hardware Communication mode SD card has two communication protocols: SD mode and SPI mode. The SD model uses four data lines parallel transmit data. It has high transmission rate, but the transmission protocol is complex, only a few MCU have this interface. There is only one data transmission line in SPI mode, and its data transmission rate is low, but a lot of MCU all support SPI bus. In addition, the transmission protocol of SPI bus mode is simple, and it is easy to simulate by software method. [3] This system is not strict to the speed of data reading and writing, we used SPI model was the best solution. The interface circuit of the system adopted C51 MCU. In SPI mode, there had four main lines between the microcontroller and the SD card: master input/slave output data wire MISO, master output/slave input data wire MOSI, synchronous clock line SCK, slave selected wire CS. SD card provides 9Pin interface to facilitate the peripheral circuit for its operation. The Pin2 was used as the data output cable of SPI bus MOSI, the Pin7 was used as the data input cable of SPI bus MISO, the Pin5 was used as SCK, the Pin1 was used as CS. In addition to the power and ground wire, other pins have been floated. The hardware connection was shown in figure 1. 6th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2016) © 2016. The authors Published by Atlantis Press 70 Fig.1 MCU and SD card connection diagram Level matching The logic level of SD card was equivalent to TTL 3.3V level, the logic level of C51 MCU was CMOS 5V level, and they can’t be directly linked. We must solve the problem of compatibility of the interface level. We used SN74ALVC164245 level conversion chip which was a general level conversion scheme.

Application of the storage system on variable rate fertilizer applicator