Is the source code used in the processors available?

Not at this time. Thousands of hours of design and development have gone into making the EyasSAT a reality.

EyasSAT, LLC is interested in recovering that investment as well as continuing to improve the products. Releasing the source could undermine that objective.

As noted elsewhere EyasSAT, LLC is quite interested in receiving ideas and suggestions for other modules that could be added to EyasSAT and will endeavor to add interesting and useful experiment modules as time allows.