I am part of the Purdue University ROV team and we are using T200 thrusters this year on our ROV. We are trying to control the thrusters with a 3.3V stm32f4 microcontroller with a I2C level shifter from spark fun https://www.sparkfun.com/products/12009. For some reason I have not been able to get it working. I am able to test that the motors work by changing the speed with an arduino.
The oddest thing is that I can read the read bytes from the motor, while still not able to set the speed. Any suggestions or knowledge into this issue would be much appreciated.