You seemed to never have practiced your craft. You are not giving detail required for the project. Nor have you stated what it is. Not sounding like a hobby project. You are correct the software is not that complex. However Embedded systems are the hardware Most of you code will involve talking to the hardware. The core of the code sort and out put may be a page. most 1980's 74XX TTL is gone, and most of it could not drive a relay. The newer CMOS stuff will not drive any relay. Now a ULN2003 or many other chips will. As far as the inputs a 24 pin mux and a 8 pin op-amp plus a few resistors and caps will give you 16 analog inputs. Plus and A/D if you pick a chip without a built in one. Some CPUs have 12 or more analog inputs( Low impedance). But you still do not know how many bit A/D you need, since you have not specified a sensor,or what temperature resolution you need (10 degree, 1 degree, 0.1 degrees) for example assuming full range 0 to 100 degress = 100 counts 8 bits(256) is OK. Now 0.1 degrees 0 to 100 degress = 1000 counts 10 bits (1024) or more is needed.

If you want someone to design, make a PC board, and write to code for < $200 try www.rentacoder.com but you will still need to supply the details.

If you hope to just get some to make it???? Many people here are professionals, and get enough challenges at work. I am not saying you can not get it. Someone on the microchip forum ask for code for a XBOX rapid fire mod, and got it.

besides the 8052 the PIC and AVR are common hobby processors. You may have some better luck there (note: there being several places not just two, it is a big internet) if no one here wants to take it on.

BTW: The Board you linked to is a poor choice for for this.