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Design option

 
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asjad



Joined: 09 Mar 2004
Posts: 52
Location: Greater Manchester - UK

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Design option
PostPosted: Sat Apr 03, 2004 7:06 am     Reply with quote
Hi All,

I am been asked to make a liquid stirer for bakery.

I have managed to produce the software element BUT

requirement is:

stir once
wait a minute
go back round

My question is (driver used to control MOTOR)

If I use a relay the life of the realy will dimish very quickly due repeated
switching

If I use a ULN2803 the noise generated will corrupt PIC operation

CAN ANYONE HELP??
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telmah
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Re: Design option
PostPosted: Sat Apr 03, 2004 2:46 pm     Reply with quote
asjad wrote:
Hi All,

I am been asked to make a liquid stirer for bakery.

I have managed to produce the software element BUT

requirement is:

stir once
wait a minute
go back round

My question is (driver used to control MOTOR)

If I use a relay the life of the realy will dimish very quickly due repeated
switching

If I use a ULN2803 the noise generated will corrupt PIC operation

CAN ANYONE HELP??

Use an SSR.
There are two basic 'types' One only switches AC (uses a thyristor or triac as the switching element), the other can handle DC (uses a mosfet - normally a pair wired as a bilateral switch).
These provide opto-isolation between the control signal and the signal being controlled.
Omron, and Crydom are the two largest manufacturers of these modules.
The AC switching types are generally cheaper for a given rating.
This site, gives an 'overview' of why you should use these:
http://www.electronicstalk.com/news/omr/omr174.html
Try www.crydom.com and
www.omron.com

Best Wishes
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