Build your own daq_lite
The circuit below illustrates how to build your own daq_lite - also shown is a photo of a completed PCB board. Note that the 80mA fuse shown in the photo and the protection diode close to it are recommended but not necessary.

Once you've built the circuit you'll need to program the PIC18f4620 microcontroller to set it up to read and write to/from a computer - MPLAB project files are availble here for this purpose. Note that you'll need a PicKit programmer to porgamme the PIC18f4620 - the PicKit2 connections shown in the schematic are required solely for this purpose.

A PCB layout is also availble here