Project idea: start another one of these sealed gardens, but also include various sensors within the bottle/compartment (CO2, CH4, O2, temperature, humidity, pr

Project idea: start another one of these sealed gardens, but also include various sensors within the bottle/compartment (CO2, CH4, O2, temperature, humidity, pressure, whatnot; but also light levels.) They can be pretty small and made to fit in nicely. The cheapest way to power them would probably be to use a simple coated electrical cable (through a layer of wax, or through something less leaky), I suppose. Having them relay data in some fashion while having all the electronics not be exposed to erosion/etc might be a bit tricky.. ideally, just the actual sensor surfaces themselves would reside within; coated wires would all go through the seal, etc. Or, the devices could be (not very easily) shielded, and just the sensor surfaces be exposed.. Of course the most fun way to do this would be to have a whole self-sustaining arduino/whatever running inside, relaying data wirelessly, and having it be powered by small solar panels (would still need to take care of erosion/etc.) Collect all data, plot it (including the light levels), and see if you can make anything out of it. :) edit actually, I can now imagine a really large aquarium, with not much light passing into the very middle; for mostly entertainment purposes, it would be nice to also be able to place a cheapo camera there which could take (infrequent, like once every 5min or 20min) timelapses. Another camera with IR lens if needed, for neat composite images.. etc etc. Not sure of possible scientific value re: the latter, but hey!