A Capacitance Based Circuit Design for Yarn Breaking Detection

Abstract

Yarn breaking is one of the most common problems in textile weaving. Focus on this problem this paper proposed capacitance based detecting-circuit to sense the status of yarn. The sensor adopts a capacitance sensor to detect the yarn on weaving machine. The yarn breaking will lead the little change in electric capacity. To detect the yarn status, Design a 555 based frequency generator circuit with capacitance sensor as one of the input. The pulse generated form 555 circuit is transmitted to MCU, MCU analysis of frequency changes to judge whether the yarn is broken and send relative control signals and location information of yarn breakage to HMI.