SPI总线驱动，AD7680 16bit ADC，74hc594驱动4位断码，ADXL193三轴加速度传感器
方案介绍：http://abieneman.wordpress.com/2010/04/04/punch-acceleration-sensor/
硬件设计：http://abieneman.wordpress.com/2010/04/04/punch-acceleration-sensor-%E2%80%93-part-2/
固件设计：http://abieneman.wordpress.com/2010/04/06/punch-acceleration-sensor-part-3/