The working principle of photoelectric sensor, control circuit and interface connection are studied. With reasonable circuit board design, the mobile robot can walk along the white track tape arranged in the field and can avoid derailment.%研究光电传感器工作原理、控制电路及信号接口连接，合理设计并制作传感电路板，使移动机器人能够顺延在场地中布置的白色轨迹纸带行走．并保证其行走时避免脱轨的现象。
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