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The paper introduces the design of the Auto-path-tracking Car. The software and hardware design method which realizes the autonomous tracing using the infrared reflective photoelectric sensors as the path recognition module is researched. The system employs Freescale HCS series 16 bit single-chip microcomputer MC9S12XS128 as its main controller and an array of photoelectric sensors for recognizing the path information. S128 energizes the servor to steer and control the speed of the DC electric motor according to the analysis of the path and speed information that from sensors. Consequently this intelligent car can track the black-guide-line automatically and move forward following the line quickly and smoothly.

Design of Auto-path-tracking Car based on Photoelectric Sensor