AVR-Chat

> I found precompiled code (.hex) for ATmega microcontroller but I'd like to
> get "C language" code please but I was not able to fnd it.
> thanks

Maybe this is what you're looking for - an Arduino library with example
sketches:

https://github.com/rayshobby/opensprinkler/tree/master/OpenSprinkler%20Contr
oller/software/libraries

HTH

Alex