In the case of a single chip and motor driven module, is it not working?
Better not to share. Optical coupling is mainly electrical isolation effect, but in a total circuit can also have another kind of effect is the light coupling can be solved on both sides of the level conversion, such as 5 V to 3.3 V system, or vice versa. But the purpose of the light coupling is used for electrical isolation, if use the light coupling, in total, the optical coupling is meaningless, level conversion can use other methods.
It's called the use of the light decouple, but you put the ground wire together and you're not isolated. The microcomputer should be isolated from the motor
Motor drive circuit, the start of the influence of the single chip microcomputer is very serious, suggest not altogether, microcontroller send start to enter a dormant state for a period of time after the command, or the nop instruction, to avoid voltage instability stage, at the start of work.
