It includes the signal amplified and filtered, AD converter , the MPU, the off -chip RAM, the power supply and interface of keyboard, display and communication.

• 设计内容主要包括信号放大与滤波单元、AD转换单元的硬件电路与软件实现、单片机与片外RAM单元、系统电源、键盘接口、显示单元和通讯单元设计。