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So far I've been able to get away with just using an arduino. The arduino has a 10 bit ADC, usually with a reference voltage of 5V--so you get a detectable voltage variation of 5/1023 or .0049 volts (4.9 mV), that coupled with a 16MHz process means you can get a respectable sampling rate (in kHz). It's cheap too (< $100)--that always helps.

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