I've built my whole controller off the arduino. right now i have lights(with spectrum recording), skimmer, pump, heaters, fans, PH, temp, CO2 and a few others. If you want/need any info let me know.The Jarduino is pretty good out of the box, if it was available when i started i would have just gone with it.
One thing i like is my datalogging with cosm. pretty easy to add the client library to the arduino and start logging if you have the network card for the arduino. Saved my butt a few ties being able to look back and see that my tank was overheating in the summer at mid day. Pretty graphs are nice.
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