The current Arduino Library (coming with IDE 1.0.1) only has one function to read analoge inputs. Since the conversion is started with the call of AnalogRead and the function waits until the conversion is complete, it is one of the most time-consuming function calls. Reading all 12 inputs one after …

Analog Input conversion time

robtillaart October 25, 2012, 8:12pm 6

check this threads

completely irq driven