[Rockin Robbins]

I think a simple calculation will show that if you could get the craft to Alpha Centauri you would never be able to learn that it arrived. You'll never generate the power for a receivable signal from a small circuit board. If you could generate 1 watt that would be amazing. However our most dense storage devices, Lithium based batteries are good for 3 years before they quickly degrade to uselessness. If you build a craft so small you would only have enough space for about a 300mAh battery. At a 10C discharge, that's 3 amps for 6 minutes then kaput. And that's if it would retain 100% of its capacity, which it wouldn't.

I may be optimistic. The camera might take up the space that I figured for the battery. I bet this thing would have a 30% chance of detection from the moon.