AVR-Chat

Hi all,

I am looking at the tiny11 and crystals/oscalators.

As you may know, I an looking at different families of chips to 
figure out which will be better/more uselful to learn.   The PIC and 
AVR both seem relativley equal.

Does the tiny11 have an internal oscalator ?

It appears that the tiny12 does.

My application is a simple one shot timer.  I want to have a motor 
that I control thru my PC's parallel port and have everything on one 
master switch.

When I turn on the PC, it goes thru it's P.O.S.T. and 'excercises' 
the port pins, turning them high and low.  This makes the things I 
have connected turn on and off durning this 20 second period.

I want the chip to receive power, start counting and then after 20 
seconds, turn on a relay.  this would then allow power to the devices.

Also, if I use 2 pins for jumpers, I should be able to select 
different ranges of timings.  say at 10 second units.  I can only see 
the need for 20, 40 and 60 seconds and timing is not important at all 
as this delay just needs to wait until the POST is done.

Funny thing is that at 25 cents each, a 3 pin oscalator will cost a 
few pennies more than the uC !

This seems like a simple beginners project.  wadda-ya think ?

Dave

At 02:53 PM 7/1/2004 +0000, Dave Mucha wrote:

>Hi all,
>
>I am looking at the tiny11 and crystals/oscalators.
>
>As you may know, I an looking at different families of chips to 
>figure out which will be better/more uselful to learn.   The PIC and 
>AVR both seem relativley equal.
>
>Does the tiny11 have an internal oscalator ?

Yes. 1MHz uncalibtated RC oscillator.


>This seems like a simple beginners project.  wadda-ya think ?

Should be a slam-dunk

Looks easy, but a quick thought, you might want to drive it through
the ic, not the parallel port, they are easy to blow, and its an
expensive, or impossible fix when you do...

I did a similar project about a year ago, but I simply used 3 pins,
and had my program set them to hi,lo,hi individually, since that
sequency never occurs on post it worked fine, then shutting off on
hi,hi,hi, which does occur during post.  This was all PIC, but should
work fine for AVR too.



Mike

----- Original Message -----
From: David VanHorn <dvanhorn@cedar.net>
Date: Thu, 01 Jul 2004 13:44:16 -0500
Subject: Re: [AVR-Chat] Tiny11 oscalator
To: avr-chat@yahoogroups.com, avr-chat@yahoogroups.com


At 02:53 PM 7/1/2004 +0000, Dave Mucha wrote:

>Hi all,
>
>I am looking at the tiny11 and crystals/oscalators.
>
>As you may know, I an looking at different families of chips to 
>figure out which will be better/more uselful to learn.   The PIC and 
>AVR both seem relativley equal.
>
>Does the tiny11 have an internal oscalator ?

Yes. 1MHz uncalibtated RC oscillator.


>This seems like a simple beginners project.  wadda-ya think ?

Should be a slam-dunk






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At 02:04 PM 7/1/2004 -0500, Michael Haisley wrote:

>Looks easy, but a quick thought, you might want to drive it through
>the ic, not the parallel port, they are easy to blow, and its an
>expensive, or impossible fix when you do...
>
>I did a similar project about a year ago, but I simply used 3 pins,
>and had my program set them to hi,lo,hi individually, since that
>sequency never occurs on post it worked fine, then shutting off on
>hi,hi,hi, which does occur during post.  This was all PIC, but should
>work fine for AVR too.

I didn't know you were picish!

I'm not, unfortunatly the useless electronics class I took was....I
wish we had a good instructor locally who could teach some AVR based
classes...but they would have to have lots of electronics
experiance....know anyone?

----- Original Message -----
From: David VanHorn <dvanhorn@cedar.net>
Date: Thu, 01 Jul 2004 14:06:39 -0500
Subject: Re: [AVR-Chat] Tiny11 oscalator
To: avr-chat@yahoogroups.com, avr-chat@yahoogroups.com


At 02:04 PM 7/1/2004 -0500, Michael Haisley wrote:

>Looks easy, but a quick thought, you might want to drive it through
>the ic, not the parallel port, they are easy to blow, and its an
>expensive, or impossible fix when you do...
>
>I did a similar project about a year ago, but I simply used 3 pins,
>and had my program set them to hi,lo,hi individually, since that
>sequency never occurs on post it worked fine, then shutting off on
>hi,hi,hi, which does occur during post.  This was all PIC, but should
>work fine for AVR too.

I didn't know you were picish! 







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That is quite a bit of overkill.  A 555 one-shot timer
would be more than sufficient, and probably
considerably cheaper (under $2USD for everything)

--- Dave Mucha <dave_mucha@yahoo.com> wrote:
> Hi all,
> 
> I am looking at the tiny11 and crystals/oscalators.
> 
> As you may know, I an looking at different families
> of chips to 
> figure out which will be better/more uselful to
> learn.   The PIC and 
> AVR both seem relativley equal.
> 
> Does the tiny11 have an internal oscalator ?
> 
> It appears that the tiny12 does.
> 
> My application is a simple one shot timer.  I want
> to have a motor 
> that I control thru my PC's parallel port and have
> everything on one 
> master switch.
> 
> When I turn on the PC, it goes thru it's P.O.S.T.
> and 'excercises' 
> the port pins, turning them high and low.  This
> makes the things I 
> have connected turn on and off durning this 20
> second period.
> 
> I want the chip to receive power, start counting and
> then after 20 
> seconds, turn on a relay.  this would then allow
> power to the devices.
> 
> Also, if I use 2 pins for jumpers, I should be able
> to select 
> different ranges of timings.  say at 10 second
> units.  I can only see 
> the need for 20, 40 and 60 seconds and timing is not
> important at all 
> as this delay just needs to wait until the POST is
> done.
> 
> Funny thing is that at 25 cents each, a 3 pin
> oscalator will cost a 
> few pennies more than the uC !
> 
> This seems like a simple beginners project. 
> wadda-ya think ?
> 
> Dave
> 
> 
> 
> 



		
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--- In AVR-Chat@yahoogroups.com, David <dsg123456789@y...> wrote:
> That is quite a bit of overkill.  A 555 one-shot timer
> would be more than sufficient, and probably
> considerably cheaper (under $2USD for everything)


I think that to get three different timing values, plus a small 
package, the tiny11 is actually cheaper than a 555, and would use 
less board space.


Dave

At 02:13 PM 7/1/2004 -0500, Michael Haisley wrote:

>I'm not, unfortunatly the useless electronics class I took was....I
>wish we had a good instructor locally who could teach some AVR based
>classes...but they would have to have lots of electronics
>experiance....know anyone?

What does it pay?

Get organized with Gary Lee, and whoever else, and I'll do a class.

At 02:13 PM 7/1/2004 -0700, David wrote:

>That is quite a bit of overkill.  A 555 one-shot timer
>would be more than sufficient, and probably
>considerably cheaper (under $2USD for everything)

The T11 is $0.25, and can be given way more interesting behaviour.

This is kind of the point of the T11 group buy.
At this price point, they start looking good for a whole bunch of low level applications.