Ok, I'll grab some pictures today and write it up, it's something I have intended to do for a long time anyway.
The sensor box spits out the 4 temps once per second over a normal serial port, so you can read it with any laptop or PC under Linux,Windows etc.
The sensors are DS18B20 one-wire temperature sensors from dallas semiconductor. They are amazing things, and only about $5 each or thereabouts.
The unit is based on a picaxe microcontroller board from
www.microzed.com.au (the aussie distributor for these things). I used the 28X project board.
I also added the LCD display so that I could see the temps directly on the unit, makes it easy to verify that everything is working ok when you first plug in the sensors and power it on.
The program for the microcontroller is very simple - read the 4 temps , send them over the serial port and display them on the LCD, sleep for a bit, repeat.
I'll dig out the camera is a while and post some closeups of the sensors etc.
Bird