Rpm signal is OK ,and don't need a divider. It's 5V signal, so need 2 resistors if you use a 3.3V moduleDoes the sampling of the rpm signal work or does the signal have to be sent via a divider (shift register)?
They work very well for small motor, so perfect for drive motor.I have also ordered these drivers, but i haven´t tested it yet.
Photo for comparison is here