For the research needs of the soil tester, a detailed investigation and analysis of the existing system is conducted to collect the user's usage and the detailed requirements of the customer. On the basis of saving the existing advantages of the instrument, we start with the improvement of the consistency of the instrument's test speed and measurement time, update the hardware measurement method, software filtering and curve simulation into the measurement speed. Through the introduction of interruption methods, the instrument's operation flow is improved and measurement operations are simplified. The database of the expert system was redesigned to make it very expandable. In the case of storage capacity operation, the database can be arbitrarily expanded, and a suitable design method is adopted to ensure that the improvement of the search algorithm after the future capacity increase does not affect the existing system. . Designing a new expert system operation method greatly reduces the complexity of operation and improves the system friendliness. In the survey, we found that the most troublesome thing for the user in the operation of the instrument is to know whether the time is waiting and whether the instrument is dead. Because the previous instrument does not have a dynamic prompt function, the system does not have any other dynamic prompt information and test status report in addition to displaying a prompt message during measurement. The inconsistency of measurement time exacerbates this situation. We use clock interrupts to continuously update the current measurement conditions and use the new methods mentioned above to ensure the time consistency of the measurements. And to provide customers with choices, according to the measurement accuracy requirements, can adjust the measurement speed. Related Research: Soil Moisture Temperature Detector To ensure the stability of the system, automatic unit testing is used to ensure reliability in the design of key modules. This guarantees a stable system guarantee in a known situation. And adopt strict module division to avoid interference between modules. And try to ensure that the system RAM redundancy, to avoid the software into the disorder due to stack overflow. In view of the system's unexpected situation, we designed a small storage management using the storage capacity of the clock chip, which can save the user's measurement data. To avoid excessive loss of users under unexpected circumstances. This is also a supplement to system stability.
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In the design, we designed the hardware simulation layer to simulate the function of the hardware, making the hardware and software design possible at the same time. It was later proved that this design solution can also save the user's experimental drug consumption and provide a good service for the logical verification of key modules.