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S CI-TECHINNOVATION 2. School of Traffic, Northeast Forestry University, Heilongjiang Harbin 150040 China ） Abstract ： In this paper, in order to efficiently collect and use solar energy, the authors designed a physical device and sys- tem can be used for solar energy automatic tracking light in micro-plant factory. From three aspects of mechanical design, hardware circuit design and design of solar energy automatic tracking light, the authors introduced hardware and software con- stitution of this system, and expounded workflow and software flow of solar energy automatic tracking light. Then, the au- thors determined design scheme of algorithm of solar energy automatic tracking light, and designed hardware circuits of this system, including light intensity measuring circuit, voltage regulator circuit of power management system and double-shaft DC motor drive system circuit. In the end, the authors pointed out that the system realized closed-loop control of double-shaft DC motor, which may greatly improve accuracy and efficiency of automatic tracking light and has important strategic significance on solving energy problems by fully exploiting and utilizing solar energy. Key words ： automatic control; plant factory; automatic tracking light; energy storage; double-shaft control 图 9 太阳能自动追光系统的软件流程图 断电？ 等待 1 s 定时到？ 启动定时器 系统初始化 开始 减速电机 结束 左右两侧光照强度 上下两侧光照强度 光照强度传感器 加权后差值在允许范围内？ 加权后差值在允许范围内？ PWM 推杆电机 PWM 蓄电池电量满足要求？ 白天？ 开关电源供电 蓄电池供电 Y N Y N Y N N Y Y Y N N 可 持续发展 Sustainable Development 060
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