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Different Source of Motors from the Source of PIC?

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thir13enth

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I always read this info on different forums in the past. Now that I am conducting a project involving motors and PIC, I just want to know why?
 

Okay, What I am trying to say is:

Batteries (supply, source, etc.) of motors, are different from the one powering my PIC.

i.e. I have two batteries, battery A and Battery B:

5V Battery (A) for my motors and 5V Battery (B) for my PIC.

Thanks for entertaining my question.
 

This exists for several reasons:

Current demands are usually much greater for motors than microcontrollers.

Motors are inherently electrically noisy and microcontrollers are adversely effect by that electrical noise.

There's two but there are other reasons.

Hope this helps answer your question.
 
Complementing.. a motor can make the power supply very unstable due to high curretn demanda (as comented before), and i think the main reason is to keep different grounds. With a common ground, any big disturbance on the motor can make a big current go inside the micro thought the GND port burning it.

CYa
 

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