We recently came across this instructable by rleyland on hacking our ISP Shield for Arduino for use with ATtiny45 and ATtiny85 microcontrollers. These are occasionally handy little AVRs, and we’ve previously written about using our ATtiny2313 target boards for the ATtiny25/45/85 family here.
Perfect for making a “Throwduino” a throwie with built-in ATtiny – just happens to be a project of mine that’s on the front page of Instructables today:
http://www.instructables.com/id/Throwduino-Basic-Light-Sensing-Flashing-Throwie-/
Hope you don’t mind the plug
Ugi