which microcontroler have more lifeTime

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#1
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hi
for first sorry formy bad english
I need make a cooling system for my car engine
I want controll fans with a havy duty microcontroller
the fans are 3 mods
off . lowSpwwd . highSpeed
I want use adc to controll the fans

my problem is :
1 car cockpit have many magnetic nois and bad wather
2 car shoud poweroff and start for manytimes in a day
3 and engine cooling system is important I must go to currect way :D

Last Edited: Mon. Nov 3, 2014 - 08:37 PM
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I feel it's one of those, If you have to ask don't do it sort of thing....

But I'm always asking questions and then doing things, so go for it

 

What you want can be done. It's done all the time.

Make one you think will work.. test it until you know it wont fail.

 

All designs are tested, more testing make a better product

 

fans require high power control and isolating the processor.

a power supply with Big inductors, big Capacitors

metal cases

Keith Vasilakes

Firmware engineer

Minnesota

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thanks my buddy

I just test it with attiny13
a voltage regulator
and 2 reley
but my microcontroller was destroyed after 3 hourses working

I hear SMDs quality is bether than normals. is true?

so your comment is I should test all types to finding good microcontroller
or all micros are same I must remove nois and chang curciut to get more life
I will try it
thank you

Last Edited: Mon. Nov 3, 2014 - 08:41 PM
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make sure that if you take power from your unit, the system should behave the normal way.

 

here are some hints.

make 100% sure to have a good ground.

have a reverse diode on the relay coils.

 

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Make sure you have reverse polarity diodes across the coils of your relay, or the spikes will destroy your micro.

Google any motor control relay circuit and you will see the diodes I'm talking about.

 

JC

 

(Possum Lodge oath) Quando omni flunkus, moritati.

"I thought growing old would take longer"

 

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ehsan_wwe wrote:
my microcontroller was destroyed after 3 hourses working

 

Either you had a dud or, far more likely, there is something (or some things) seriously wrong with your design!

 

Remember that the engine compartment of a car is a very hostile environment for electronic components!

 

The datasheet gives you the safe operating conditions for the device - exceed any of them, and you are very likely to damage you chip.

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ehsan_wwe wrote:

thanks my buddy

I just test it with attiny13
a voltage regulator
and 2 reley
but my microcontroller was destroyed after 3 hourses working

I hear SMDs quality is bether than normals. is true?

so your comment is I should test all types to finding good microcontroller
or all micros are same I must remove nois and chang curciut to get more life
I will try it
thank you

 

It's not the parts you are using, it's how you are using them.

You need to have good protection for your parts as talked about above.

Testing means testing your design, finding the failure and then determining why that failure happened.

 

the Micro was not bad

SMD would not improve things

 

Remove noise and improve power supply is the way to fix it

Keith Vasilakes

Firmware engineer

Minnesota