This is the source package for my ATTiny25 based digital thermostat.
It'll require that you've installed gcc-avr and binutils, as well as avrdude for programming the chip with the firmware.
To build the project, run make main.hex and to program the chip via a USBTinyISP (http://www.ladyada.net/make/usbtinyisp/index.html) run make program.
See LICENSE for licensing information.