Answer
Those are phase dots. They refer to the 'start' of the winding based on a predetermined winding direction (CW or CCW). This allows you to tell at a glance what 'polarity' the windings have so you can figure out how the current will flow.
I am using arduino pro mini (which contains Atmega328p AU ) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I...
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