Tons of updates for the code:

• Compute checksum based on the Wayne/RJ spreadsheet
• Spit out DMX data in the loop with a toggle when complete
  · Blinks red after successful programming
  · Blinks white after unsuccessful programming
• Fixup DMX arduino code to use the 0x37 start code instead of 0
• Tested and working (with one of my 5 TIR floods)
Add test.c

• Quick native C test which I used to run serial number/start address tests against known working values when verifying the checksum calculations
• Based on code from Wayne/RJ's spreadsheet
• Build like this: gcc -o test test.c
Add Wayne to the thanks since he was involved in the work I used as well