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I tried installing the arduino library for processing, but on the subfolder "library", inside the "arduino" folder, it appears a .rar file, instead of a .jar executable file. A friend of mine passed me the .jar file but when seeing it on my computer it apears as a .rar file.
Answers
I think .jar files are actually .zip compressed files. :>
Well the problem is that my arduino doesn't follow the commands given by processing. Although, the communication between processing and arduino is stablished it doesn't follow the code.