Method of Control of Precision Seeding of Corns

摘要

In recent years, corn planting technology in China has attracted the attention of scholars and been greatly developed. Based on the embedded technology, this paper proposes a corn precision seeding system with a test platform of corn precision seedingfor simulation experiments. An embedded mobile terminal was used in the system to control sound and light alarms and display the status of repeat seeding, miss seeding and the seed quantity remained. STM32 controller was applied to collect and process data. Speed sensors were utilized to collect the speed of the tool. Moreover, CAN bus was used for communication between the terminal and the controller. Combined with the mathematical relations among seed volume, motor speed and tractor velocity, the digital PID algorithm was used to control a seeding motor and the motor controller achieved real-time adjustment to form closed-loop feedback. The experimental results based on the test platform demonstrated that in different speed settings. The relative error of seeding is 4.83%, which is nearly two-thirds less than the error of no PID control. In addition, the error of seeding interval was less than 10%. The result of test illustrating that the system could meet the design requirements to be used for variable seeding of corn.