I love the ATtiny85. I use it in practically every project of mine — components of CastMinder are powered by the ATtiny85, and HaptoTech is completely powered by the ATtiny85. The ATtiny is also the brains of my game console/business card with a screen.
Regular Arduino boards are awesome for prototyping and extended development, but sometimes it’s necessary to turn to something a little cheaper and smaller. The ATtiny85 satisfies both of these constraints quite handily — it costs only about a dollar, and the whole microcontroller is no bigger than the fingernail of your pinky.
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An interesting link found among my daily reading