Jul 29, 2013 · In my model I used a BLDC, but the ports are essentially the same. You connect the R port of the BLDC to both the R ports of the rotary and torque sensors. The C port of the Rotational Motion sensor is to be connected to ground (so that its "parallel" to the motor) However, as @Vincent Riboulet said, the torque sensor needs to be in series with