November 23, 2018 4:04 PM CET
Hi,
the LEGO M motors are notoriously hard to drive. Try them with LEGO's own V2 IR receivers, and you'll likely get the same results.
The problem with M motors is they have a large capacitor in parallel with the actual brushed DC motor in them.
When the DRV8833 motor driver chip in the SBrick Plus tries to charge this capacitor, it may go into overcurrent protection mode, and cut the PWM signal.
This problem is not always present, most M motors and most SBricks work together just fine. If you can, please try other M motors and SBricks.
The problem gets worse as the M motors need to supply more torque. If nothing seem to work, try using a thin silicon lubricant on the moving parts of your creation to reduce friction. You may try to apply lubrincant onto the planetary reduction gear inside the M motor, but you'd need to take it apart.
(If nothing helps, and you _are_ willing to take the M motor apart, you can remove the capacitor, but this obviously isn't a real solution for most customers of course.)
If you can't solve the problem, please write to info@sbrick.com, reference this thread, and ask for a replacement. You'll need to send your SBrick Plus and M motor to us, and you'll get a pair that works together better.
We can't promise we'll be able to do this in every similar case, however we're willing to do this in yours, since you provided lots of important information we can use to make SBrick better.
Cheers,
Tamás
This post was edited by Tamás Fábián at November 23, 2018 4:04 PM CET
