Protecting MCU power

[mahlev]

Hi,

I have a newbie question:
How do I prevent a current drawing component (lets say a motor) from interfering in the operation of a MCU?
Lets say I've got a 5V power source who need to supply power for both the MCU and the motor.

Thanks in advance

 

[be80be]

Do you know how many times this has been ask ? You use a diode to prevent EMF

google freewheel diodes

flyback diode sometimes called a snubber diode, freewheeling diode, suppressor diode

Flyback diode - Wikipedia, the free encyclopedia

 

[MikeMl]

And that alone may not do it. You also need to use wiring/pcb techniques that avoid ground loops, use lots of capacitive bypassing, keep the motor wiring away from the MCU, use twisted (maybe shielded) wiring to the motor, etc, etc...

There have been several long threads on these forums about MCU switching inductive loads and spurious reseting/rebooting of the MCU.

Here is one thread about this.

Another long one.