Abstract: An IoT irrigation system based on the AT80C51 microcontroller had been developed to address the issues of unintelligent and untimely irrigation in traditional artificial irrigation methods,the system could obtain the environmental conditions of farmland through temperature and humidity sensors and transmit them to remote data centers through wireless communication modules. At the same time, the system was equipped with irrigation system threshold control equipment, which could adjust and control the pumping pump as needed. When the system determined that the farmland soil was dry, the environmental conditions triggered the system threshold and pumped water for irrigation in a timely manner, ensuring that the soil always maintained a suitable temperature and humidity.Through simulation experiments and actual testing, greenhouse lettuce at different growth stages in spring and summer was taken as the research object. Under intelligent irrigation, the average fresh weight of each plant above ground increased by at least 11.31% compared to traditional artificial irrigation;the average drainage of intelligent irrigation in spring and summer was 64.96% and 63.47% lower than that of traditional artificial irrigation, respectively;the irrigation water efficiency of intelligent irrigation in spring and summer was 68.03% and 98.61% higher than that of traditional artificial irrigation, respectively. The system operated stably, and the relevant experimental data and phenomena met expectations.

Key words: AT80C51, IoT, intelligent irrigation system for agriculture, traditional artificial irrigation