AVR - Nasty thing

Last month, I had a project that need one ‘big’ button that can interact with my computer software. There shouldn’t be a problem if I bought a decent programmer for AVR. But I like to make it from the lowest level: the beginning. First, I had to choose what kind of MCU (micro controller) I should use. From what I needed, Attiny2313 or Attiny45 from Atmel was good enough. And then all the problems began…
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