The hardware is a small PCB with an Atmel AVR tiny2313 microcontroller and a FTDI FT232R usb controller. The temperature probe is a Dallas DS18S20 1-wire temperature sensor. The firmware is written in C and compiled with AVR-GCC.
The hardware is attached to a server where a Perl-script reads values every 10 minutes and stores the reslut in a mySQL database.
The PCB without any components. The PCB also has a LCD interface wich is not used here.