Recent content by RPLaJeunesse

I'll assume you can get one motor running at the target RPM as desired, with a speed only control loop. For that motor have an angle sensor with available output of some sort. For the second motor have a similar angle sensor. Control the second motor by having it track the angle of the first...

How the Arduino reads the sensors could be the issue, with limited processing they may not be being read often enough. I would test to see what frequency the sensor can produce before the Arduino starts dropping data. Then make sure the system never runs more than about 75% of that frequency.