I could ask 1000 questions because I find it very interesting what you did. Maybe my two most important questions:
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Did you write sketches with the Arduino IDE or did you only use the bootloader to upload program that you wrote in C or assembler? I mean will a digitalWrite() line of code be in space?
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Can you explain the space to earth communication? What kind of signal is used, how does the receiver look like and what tasks does Goldberg-1000 have?