Circuit Board Design and API for a Ethernet I/O peripheral controller for Visual Basic 6.0

I am in need of a circuit schematic that I can in turn use to layout a circuit board. I also need recommendation for ICs as well. I need a design for a 16 input 16 output (32 total I/O) Ethernet board that can easily be controlled by a Visual Basic 6.0 application. The board should be able to be individually addressed if there are multiple boards present on one network. The outputs need to be logic level and output +5v when in high state. The inputs should accept around 0-30 volts. I would prefer the use of a embedded Ethernet jack such as those manufactured by Lantronix or Digi. An i2c or SPI connection from the embedded jack to the expander chips would be best. The control application in Visual Basic only needs to turn the outputs on individually and read the inputs when requested, nothing more than that. Speed is important barring network issues the requests should take no more than 100ms to complete, anything faster than this is a definite plus. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Windows XP Windows Vista Windows 7