Gents,
I've made some progress on a "lab logger" -- a little board which logs the ambient temperature and relative humidity of your lab.
The idea is to have an Si7021 + ATtiny85 + FTDI chip on a board small enough that it can be shipped cheaply along with any references. Plug it via USB cable, start the script, and you're capturing temp + humidity in a CSV file.
Prototype stage 1 was getting this to work with an Arduino (an ATmega 328), using the Arduino's built-in USB-serial converter. I got that working last week.
Prototype stage 2 was getting this to work using an ATtiny85, using an FTDI FT230X for USB. I've just gotten that working today.
The next step is to design a little board for it.
Anyway, just wanted to share the progress