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Design of a Control System for Magnetic Plate-type Precision Seeding Production Line Based on PLC and MCU

Based on the magnetic seed-metering principle, a new magnetic plate-type precision seeder and seeding pro- duction line were developed to meet the requirements of precision seeding. The control system was designed based on Programmable Logic Controller (PLC) and Mico Controller Unit (MCU). Automatic programming techniques, sensor technology, acceleration and deceleration control of step motor were integrated into the system. The PLC control system controls the workflow of the production line to realize accurate positioning of the tray and its coordination. The MCU control system controls the flip of the sowing board, as well as the up-and-down movement of the seed case for whole tray seed-filling and sowing. Seeding tests for the magnetic powder coated rape seeds showed that the rates of single-seeding, over-seeding and miss-seeding were 90.2778%, 4.6875% and 5.0347% respectively. The seeding speed was up to 14s per tray. This result meets the requirements of precision seeding.