I want to program the ATtiny85 with some V-USB code, but I don't want to spend $15+ for an AVR programmer. I know I can use an Arduino as an ISP to program other Arduinos, but I don't know how to use it as an ISP programmer with avrdude. For example I would want to do "avrdude -c arduino -B 1 -p t85 -U flash:w:main.hex" through the command prompt on Windows, but I have no idea how. Can anyone help?
Click the Start button and Run or type in the Search box for Cmd or Command. Then change directories till you can get to the directory below:
\arduino-1.0.1\hardware\tools\avr\bin\avrdude -c arduino -B 1 -p t85 -U flash:w:main.hex
Search on the web for Arduino as ISP and do some reading. You should be able to find answers to most of your problems.
It's not that difficult and has been done many times by other folks who used that approach.