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With the continuous development of agricultural informatization and mechanized high-tech, the degree of agricultural automation is increasing. The single-chip microcomputer equipment has many advantages such as diverse functions, simple circuits, and low cost, and has broad market prospects. Therefore, the measurement of soil moisture and fertility based on single-chip microcomputers can be widely used in the market. This design is the design of soil moisture and fertility detection system. The system uses STC89C52 microcontroller as the control center of the system, uses the YL69 humidity sensor as the soil humidity sensor module, uses the JXBS-3001-NPK soil nitrogen, phosphorus and potassium three-in-one fertility sensor as the soil nitrogen, phosphorus and potassium sensor module, and uses LCD12864 The display is used as the display module of the system, the buzzer is used as the notification module, and the button module is used to set the upper and lower limit values of the preset value of soil moisture and fertility. The soil moisture signal is collected through the YL-69 humidity sensor, the soil fertility signal is collected through the JXBS-3001-NPK soil nitrogen, phosphorus and potassium three-in-one fertility sensor, and the single chip STC89C52 processes the signal and outputs the control signal to control the Buzzer sounds. At the same time, the single-chip microcomputer sends the data that is not within the range of our preset value to the display screen to make a mark.
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