In a recent blog post on omzlo.com, [Alain] explains how they found a bug in the Arduino SAMD21 analogRead() code which causes the output to be offset by between 25 mV and 57 mV. For a 12-bit ADC ...

It’s a dual-channel 10-bit ADC cape that ties into the BeagleBone ... and a cherry-picked flash drive can save something like 14-18 megabytes per second. But the two 10-bit ADCs, running ...