用EZ-USB做的数据采集卡，做毕业设计的可以参考参考-ez-usb，DAQ，while you are doing it ,you can reference。

This interface is designed to work on a PIC18 family. It acts as an analog interface and expansion module for the USB-6008/9 DAQ of NI to use a fast incremental encoder since the 6008/9 only reaches 20KHz and the fast encoder can reach even 50KHZ on

labview usb6009 心电模拟器-DAQ ECG with usb 6009