Design and testing of an apple grading control system

摘要

In order to improve the elïïciency of apple's grading and ensure the scientilïcity and objectivity of grading, this paper presents a three-stage grading system, namely weighing grading, color grading and shape grading. Hardware design uses high-performance S3C2440 embedded controller, DSP controller, single-chip micro-processor controller, pressure load sensor, color recognition sensor, graphic recognition sensor and motor. Software design includes the realization of apple weighing DSP monitoring procedures, color grading SCM C51 procedures and shape grading embedded system procedures. Test results show that the maximum relative error of single stage is 5.6%; therefore system can fully meet the practical demands of apple grading.