Using BEMF with the SAMD21BLDC motor kit

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I am using the ATMEL 42681A SMART ARM motor control kit which uses a plug in SAMD21MOTOR board developing a brushless DC motor control system.


I found it a great kit until I came across the way they have wired up the Back EMF voltages to the SAMD21 Analogue Comparators


Since the SAMD21 only has 2 comparators the design SEEMS to simply wires one BEMF pair BOTH to pin PB07.


So I was wondering if anyone has used BEMF control with this kit or indeed with a SAMD21 and if so how?




Last Edited: Wed. May 31, 2017 - 12:44 PM