Hello,
I've completed many similar projects, and from a rough estimate shouldn't take much more than a day. Without knowing the full extent of the work, I'd suggest an hourly rate of $30 (in the expectation this could lower the project price). Additionally I've performed extensive work in the areas of remote instrumentation and wireless links, and have some ideas to further your project you may be interested in.
Feel free to discuss this bid with me further if you wish. I am available via phone, email, IM and skype. I am based in the Northeastern US, where all work will be completed.