I have this a MegaMo SY3056 BLDC Spec.PDF MegaMo SY3056

And beside the cables that are connected to the ESC i have thses encoder cables: Encoder Cables

How can i read this encoder? and what values do i get?

Can i know the absolut position of the motor ?

  • \$\begingroup\$ Without a proper data sheet, who can tell? All we can glean from the one you have there is that it has a hall-effect sensor. \$\endgroup\$
    – Majenko
    Nov 3, 2011 at 10:10
  • \$\begingroup\$ maybe the manufacturer has a separate generic data sheet for the sensors \$\endgroup\$
    – JustJeff
    Nov 3, 2011 at 10:57
  • \$\begingroup\$ Yes, but i couldn't find the datasheet anywhere ... \$\endgroup\$
    – Danpe
    Nov 3, 2011 at 11:42

2 Answers 2


I found a data sheet for a different MegaMo motor. It seems to have similar wiring, with the following specs related to the encoder connector:

A Hall Sensor         Blue 
B Hall Sensor         Green 
C Hall Sensor         Yellow
+6V Logical Supply    Red 
GND Logical           Black

(from the BL2235 datasheet)

This should at least get you started on reading the encoder. Couldn't find anything more detailed about the sensors/resolution. Hopefully you find this helpful.


With no proper datasheet available looks like you will have to guess (I had a look, very little on the website - you could try sending an email to the address given there)

Is there an encoder attached to the motor also? How many wires are coming from the motor in total?

A few thoughts...

If the wires going into the casing in the top picture are the main motor connections:
I think the red is for V+, black for ground. This is easily confirmed by briefly applying power and see if the motor turns. The other three(?) are likely to be for the hall effect sensor - possibly white for V+, green for ground and [unseen wire] for output.
It would be wise to use a current limited supply if you have one (e.g. bench supply) If not I would put a 100-500 ohm resistor in series with the V+ to the sensor (whichever wire you are trying) The sensor output may be open drain, so a 1-10k resistor from the output to V+ maybe required.

Not sure about the encoder wires without more info.

More photos/explanation of wiring/electronics (can you partially dismantle to get a better look if necessary?) might help to guess better.


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