Monitoring and Performance Analysis of Seed Sowing Using Photoelectric Sensing

Abstract

The seed sowing on-line monitoring system based on the principle of optical frequency conversion sensing is developed. The photoelectric flow sensor is used to design the photoelectric flow receiver and the photoelectric flow emitter. The system takes STM32F103ZET6 single chip microcomputer, step-down chip LM2576, and voltage comparator LM393AD as the core. On this basis, the slot wheel transcendental rotation and fast supplemental seeding method is adopted, namely, real-time miss-seeding monitoring and supplemental seeding for seed sowing. The laser photoelectric sensor (PS) is used to monitor miss-seeding. The Hall sensor is applied to monitor the rotation speed of the seeder in real time, and the corresponding supplemental seeding, speed monitoring, and miss-seeding monitoring modules are designed. When seed leakage occurs, the set light emitting diode (LED) alarm module will inform the system that supplemental seeding is needed, and the module corresponds to the seeding channel. In the experiment, the miss-seeding rate was reduced from 3.8% to 0.5% after the system adopted the supplemental seeding module, that is, the mechanical seed sowing needs supplemental seeding. Under the condition of automatic supplemental seeding, when the continuous missing seeds ≤3 and the time interval error ≤1.4%, the missing seeding rate ≤0.8%, so as to realize the non-deviation supplemental seeding. The accuracy of single seed monitoring is more than 98%, and the accuracy of seed sowing monitoring is 94.7%, which means that the designed seed sowing monitoring system has high monitoring accuracy.