But when I finished the sketch, I realised that almost all the stuff would still be needed! In fact, having a computer offered a number of advantages, including a large screen, and a large amount of storage! Huh.
A Canon 40D wants (as per these notes) between 7.5 and 8.2 volts with a peak capacity of 1400 amps. Sealed Lead Acid battery is up for the task. But I don't have a step-down buck transformer with enough power. So that's the missing link right now. I could rely on the grip with dual batteries; or get out the inverter and stock DC coupler.
And, of course, one will likely need to heat the lens. So a dew wrap and controller is needed.
In lieu of an intervalometer, the computer is needed, running EOS Utility. The ASUS netbook can be powered off 12 volts. So off a lead-acid battery. Directly. And I've already hacked that cable.
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