本系统以单片机AT89C52为核心,霍尔传感器为信号采集单元，AT24C02存储器构成的掉电保护电路，LCD1602为显示模块，实现简易的出租车计价功能。本系统具有操作简单，显示明了，功能强大等特点。-This system by single chip microcomputer AT89C52 as the core, the hall sensor for signal acquisition unit, AT24C02 memory of power-fail protection circuit, LCD1602 to display module, achieve the function of simple taxi valuation. This system has simple operation, display and clear, powerful functions, etc.