I always love industrial parts. I'm hoping to come up with a system that's reliable and useful, and the average grower can easily set it up with no electronics knowledge.

for the ph sensor, I was thinking of getting a cheap one off ebay with an analog display. I can build a resistive sensor easy enough, but the parts and time probably add up to more then what's ready made on ebay. besides, I'd end up frying it if I made one. should be able to connect the analog tester to my interface card with very little modification. 4 analog inputs, 0 to 5v.

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I eat babies, yum.. where's the ketchup?
C Code. C code run. Run, code, run... Segmentation fault (core dumped).. aww shit