Lab jack Low-Voltage U3-LV USB Module - High-Speed Data Acquisition DAQ Device with 4 Analog Inputs – Digital I/O and Flexible I/O Channels - Compatible with Third party Software

I was able to script it fairly easily in python and use it as a computer interface to various breadboarded prototypes. Plugged into a high power USB socket you can even drive small motors or servos directly with it. Great tool any time you need to try out an idea for computer/real-world interface.

This device allows acquisition of real world data and control of external devices and does it simply. Easy to use, great documentation and support, all at a fair price.