（1.Electrical and Information Engineering Academy,Beifang University of Nationalities,Yinchuan,Ningxia 750021;2.Creative Education Center,Beifang University of Nationalities,Yinchuan,Ningxia 750021)
Farmland humidity is an important factor in the natural environment of agricultural. In order to ensure that the field moisture is suitable for the growth of crops,a precision irrigation system based on STM32/AT89C51 single chip microcomputer was designed.Main function:node humidity sensor to detect soil moisture and sent to the microcontroller，single chip digital display to LED display and mobile phone；irrigation if necessary:could controll it by autocontrol or manual control through 485.In this study, a watersaving irrigation system based on STM32 was studied in order to achieve realtime control and control of the effect of farmland moisture.