26 August 2012

V0.9 is the current published version on this website.
It has come to my attention that I have inadvertently left a #define set to force the ADC reference voltage to be 1.024V.
#define VREF1024 in sysconfig.h.

This was defined to test the possibility of increasing the ADC�s resolution at low expected back EMF feedback voltages.

The ultimate intention is the reference voltage will be chosen based upon the expected feedback voltage, a lower reference for lower speed demands.

In addition to provide a better back EMF feedback term, the intention is to also take a median average of several consecutive ADC readings each BEMF sample interval.
Presently this is a single sample, and is very vulnerable to random noise affecting the sample.

Further research into this method can be found on this page.