All the issues in the previous log have been resolved, and the RTI control/power system has been tested, and is working!

What's going on here is that I have LEDs connected to matching high-side and low-side channels (i.e. high 1 and low 1, high 2 and low 2, high 3 and low 3, etc., all the way to 8). The Arduino is activating the matched channels simultaneously, which should turn on each of the 8 LEDs in sequence for 1/4 second, as well as setting off the beeper. The system can provide up to 1 A of current to these 3W Cree LEDs. When the lights are off, a +5 positive voltage is turned on to the USB and shutter servo control, which is checked with a multimeter. This setup also doubles as an LED tester, to make sure they're working, and are wired correctly.

Instructions for this step, as well as the Arduino software required, will be up in the near future. And construction of the system is now in the home stretch!