AVR-Chat

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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