AVR-Chat

From: mpdickens 
2. RE: OT BLOODY HOT WEATHER
From: David VanHorn 
3. RE: OT BLOODY HOT WEATHER
From: mpdickens 
4. RE: OT BLOODY HOT WEATHER
From: Jeffrey Engel 
5. Re: OT BLOODY HOT WEATHER
From: "phisatho" 

6. RE: OT BLOODY HOT WEATHER
From: David VanHorn 
7. Re: Re: OT BLOODY HOT WEATHER
From: David VanHorn 
8. ADC conversion speed (was OT BLOODY HOT WEATHER)
From: "Larry Barello" 
9. Re: ADC conversion speed
From: David VanHorn 
10. RE: A OT BLOODY HOT WEATHER - enough
From: "Cobb, Quentin" 
11. Re: Multiple software uarts..........
From: "ktucker8825" 
12. ATmega16 beginner
From: jay marante 
13. ATmega16 beginner
From: jay marante 
14. ATmega16 beginner
From: jay marante 
15. ATmega16 beginner
From: jay marante 
16. ATmega16 beginner
From: jay marante 
17. ATmega16 beginner
From: jay marante 
18. ATmega16 beginner
From: jay marante 
19. RE: ADC conversion speed
From: "Larry Barello" 
20. RE: ADC conversion speed
From: "Kathy Quinlan" 
21. RE: ADC conversion speed
From: David VanHorn 
22. Re: OT BLOODY HOT WEATHER
From: Russell Shaw 
23. Re: OT BLOODY HOT WEATHER
From: David VanHorn 
24. Re: OT BLOODY HOT WEATHER
From: Alex Gibson 
25. RE: ADC conversion speed
From: "Larry Barello" 


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Message: 1
Date: Wed, 12 Nov 2003 09:38:28 -0800 (PST)
From: mpdickens 
Subject: RE: OT BLOODY HOT WEATHER

What are you talking about...?... Have you been
following this thread? Further, power supply fans are
BUILT INTO the power supply. To the best of my
recollection, no one in this thread has suggested that
Kat take the power supply apart and reverse the fan.


Marvin Dickens
Alpharetta, Georgia USA


--- David VanHorn wrote:

> Heat management: All fans should blow out, except
> the one in the back of the case that blows onto the
> CPU, that one goes in. 
> 
> Power supply fans should ALWAYS blow out.
> Why would you want the heat retained?



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Message: 2
Date: Wed, 12 Nov 2003 12:58:04 -0500
From: David VanHorn 
Subject: RE: OT BLOODY HOT WEATHER

At 09:38 AM 11/12/2003 -0800, mpdickens wrote:

>What are you talking about...?... 

Getting heat out of a computer as expeditiously as possible

>Have you been following this thread?

Yes, have you?

> Further, power supply fans are BUILT INTO the power supply. 

Best place for them, in my opinion. Having them in the hard drives would impair their efficiency pretty seriously.

>To the best of my recollection, no one in this thread has suggested that
>Kat take the power supply apart and reverse the fan.

I believe I just did, if the fan is currently set to blow it's waste heat into the pc cabinet. 

Why would blowing that waste heat into the PC ever be a good idea?

Also, the impacted microdirt ends up forming a nice layer of insulation all over the power supply components, when the fan blows in. Apparently there's a static charge imparted from friction with the fan. 

When I have them set to blow out, I don't see this buildup in the PS.




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Message: 3
Date: Wed, 12 Nov 2003 12:27:06 -0800 (PST)
From: mpdickens 
Subject: RE: OT BLOODY HOT WEATHER


--- David VanHorn wrote:

> I believe I just did, if the fan is currently set to
> blow it's waste heat into the pc cabinet. 


The fan in my power supply circulates air out the back
of the PC. In tweny five years of professional
experience in data processing, I've never seen a fan
that sucks air into the power supply from the back of
the PC. This configuration would empty pre-heated air
into the pc cabinet.

If the power supply in your machine shipped to as you
described, I'd find another vendor....


Regards


Marvin Dickens
Alpharetta, Georgia USA 

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Message: 4
Date: Wed, 12 Nov 2003 12:54:33 -0800 (PST)
From: Jeffrey Engel 
Subject: RE: OT BLOODY HOT WEATHER


I've been enjoying this thread from the sidelines,
since I also have overheating issues with one of my
AMD computers. Hopefully, one of the ideas you've
provided will work for me as well.

BTW, I'm new to this List via the AVRx List.

Jeff Engel
Arlington, TX
USA
--- David VanHorn wrote:
> 
> >
> >If the system is locking up when you run graphic
> >intensive programs, the heat produced by the gpu is
> >probably playing a role in heating up the ambient
> air
> >inside the case.
> 
> Heat management: All fans should blow out, except
> the one in the back of the case that blows onto the
> CPU, that one goes in. 
> 
> Power supply fans should ALWAYS blow out.
> Why would you want the heat retained?


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Message: 5
Date: Wed, 12 Nov 2003 22:44:52 -0000
From: "phisatho" 

Subject: Re: OT BLOODY HOT WEATHER


> I believe I just did, if the fan is currently set to blow it's waste 
heat into the pc cabinet. 
> 
> Why would blowing that waste heat into the PC ever be a good idea?
> 
> Also, the impacted microdirt ends up forming a nice layer of 
insulation all over the power supply components, when the fan blows 
in. Apparently there's a static charge imparted from friction with the 
fan. 
> 
> When I have them set to blow out, I don't see this buildup in the 
PS.

Yes you dont see the build-up in Ps.
But you will see the them on motherboard and case gaps.




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Message: 6
Date: Wed, 12 Nov 2003 17:52:01 -0500
From: David VanHorn 
Subject: RE: OT BLOODY HOT WEATHER


>
>If the power supply in your machine shipped to as you
>described, I'd find another vendor....

I suspect that I normally buy PCs from places that you wouldn't :)

I've seen a number that go the wrong way, and it's a simple matter usually to flip the fan around. At the prices I pay, I should probably be thankful that the fan actually spins.





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Message: 7
Date: Wed, 12 Nov 2003 17:57:12 -0500
From: David VanHorn 
Subject: Re: Re: OT BLOODY HOT WEATHER


>
>Yes you dont see the build-up in Ps.
>But you will see the them on motherboard and case gaps.

Right, but it's less important there. 
The main heat generating components are the ones that need to stay clean. 

That's one major reason I went with the slushbox, and I've never looked back.
My motherboard looks almost pristine, after two years of 24/7 service, where normally I'd be having to brush the gunk off every 6 months to try and keep ahead.

The big radiator on top has much less frantic airflow than the typical CPU fan, and I don't see a significant buildup there either. My case temperature isn't any warmer today than it was on day 1, plus or minus a few degrees.. If I ever see it significantly warmer, and the room isn't, then I'll know the radiator needs a meeting with the airhose. 

Basically, the slushbox gets the heat out of the computer very effectively, without the noise and dirt problems typical of high speed fans, in less than a cleanroom environment. 





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Message: 8
Date: Wed, 12 Nov 2003 15:50:00 -0800
From: "Larry Barello" 
Subject: ADC conversion speed (was OT BLOODY HOT WEATHER)

Any chance that this bloody boring topic can be moved somewhere bloody else?

Here is a new topic: How fast can you do ADC conversions on a tiny26 @ 16mhz
and get 8 bit accuracy? Has anyone tried? Is it in the specs anywhere?

If you respond, please remove the OT subject!

TIA




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Message: 9
Date: Wed, 12 Nov 2003 18:57:40 -0500
From: David VanHorn 
Subject: Re: ADC conversion speed


>
>Here is a new topic: How fast can you do ADC conversions on a tiny26 @ 16mhz
>and get 8 bit accuracy? Has anyone tried? Is it in the specs anywhere?

I'm running it at 250kHz with 8M clock, and not having a problem.
It's a little beyond the spec, but in my app, the last bit of accuracy isn't that important. 

Beware the on chip "reference".. My T26's were all around 2.7V, as opposed to 2.5V nominal. We had to go to an external reference. 





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Message: 10
Date: Wed, 12 Nov 2003 17:47:23 -0700
From: "Cobb, Quentin" 
Subject: RE: A OT BLOODY HOT WEATHER - enough

>> Any chance that this bloody boring topic can be moved somewhere bloody
else?

It's already covered in over 20 yahoo groups. Just search for overclocking,
they are the ones usually concerned with overheating problems.

Although we all love Kat and she's the list owner, this thread really has
nothing to do with AVR's!


-----Original Message-----
From: Larry Barello [mailto:yahoo@barello.net] 
Sent: November 12, 2003 4:50 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] ADC conversion speed (was OT BLOODY HOT WEATHER)


Any chance that this bloody boring topic can be moved somewhere bloody else?

Here is a new topic: How fast can you do ADC conversions on a tiny26 @ 16mhz
and get 8 bit accuracy? Has anyone tried? Is it in the specs anywhere?

If you respond, please remove the OT subject!

TIA


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Message: 11
Date: Thu, 13 Nov 2003 02:07:48 -0000
From: "ktucker8825" 
Subject: Re: Multiple software uarts..........

That gave me an idea.
If I open both ports in the same subroutine, use them and then close
both ports the program works.
I can program around this. I just thought it was strange.

Thanx

--- In AVR-Chat@yahoogroups.com, "poitsplace" wrote:
> it could be written in basic, but it's going to be every bit as 
> complex (if not more so) as writing it in assembly. Basically you 
> have to make a single routine that handles both 
> ports "simultaneously" (two serial ports doing input/output within 
a 
> common timing loop or interrupt). It's not something for the 
> beginner and I know I'm not skilled enough to do it right now.
> 
> 
> --- In AVR-Chat@yahoogroups.com, "ktucker8825" 
> wrote:
> > I am currently working on a project with bascom-avr, atmega16L.
> > i am utiliizing the hardware usart to talk to a serial LCD 
display. 
> i
> > need 2 additional ports. i can get both software uarts to work, 
but
> > only one at a time. when i try to implement both software uarts 
only
> > one will work properly. the other is putting out garbage (as seen 
on
> > the terminal) my code is only calling one software uart at a
> > time....... i am (at this time) only interested in outputting 
data 
> on
> > these ports and the output strings will be sent with no 
handshaking
> > as canned strings ............any ideas
> > TIA
> > 
> > Ken Tucker
> > 
> > ***** Code Snip
> > 
> > Do
> > 
> > Call Serial_1()
> > Call Serial_2()
> > Loop
> > 
> > Sub Serial_1()
> > 
> > 'open portD.4 for output
> > Open "comd.4:9600,8,n,1" For Output As #1
> > 
> > 'open portD.5 for input
> > Open "comd.5:9600,8,n,1" For Input As #2
> > 
> > Print #1 , "this is a test output of soft port 1";
> > 
> > 'close ports
> > Close #1
> > Close #2
> > 
> > 
> > End Sub
> > 
> > 
> > Sub Serial_2()
> > 
> > 'open portD.6 for output
> > Open "comd.6:9600,8,n,1" For Output As #3
> > 
> > 'open portD.7 for input
> > Open "comd.7:9600,8,n,1" For Input As #4
> > 
> > Print #3 , "this is a test output of soft port 2";
> > 
> > 'close ports
> > Close #3
> > Close #4
> > 
> > 
> > End Sub



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Message: 12
Date: Wed, 12 Nov 2003 18:50:53 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 13
Date: Wed, 12 Nov 2003 18:51:31 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 14
Date: Wed, 12 Nov 2003 18:52:34 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 15
Date: Wed, 12 Nov 2003 18:52:56 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 16
Date: Wed, 12 Nov 2003 18:53:30 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 17
Date: Wed, 12 Nov 2003 18:54:06 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 18
Date: Wed, 12 Nov 2003 18:54:20 -0800 (PST)
From: jay marante 
Subject: ATmega16 beginner

Im a beginner to ATmega16. Can anyone please help me
with regards to the settings, say the clock or
crystals, and how i should initialize the chip. TIA. -jay

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Message: 19
Date: Wed, 12 Nov 2003 20:52:27 -0800
From: "Larry Barello" 
Subject: RE: ADC conversion speed

250khz clock, or conversion speed? Must be clock as that is 1/32 the cpu
clock a convenient divisor.

Hmm, I think I'll check to see if Atmel has a newer data sheet. Guess what,
they do! Well, the latest data sheet (6/03) specifies the absolute accuracy
of the ADC @ 1mhz as 2 lsb. That is pretty speedy: 13 uS/conversion or ~75
ksp. Yeah!

Now, I wonder what happens at 2 or 4 mhz...


-----Original Message-----
From: David VanHorn [mailto:dvanhorn@cedar.net]
Sent: Wednesday, November 12, 2003 3:58 PM
To: AVR-Chat@yahoogroups.com; AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] ADC conversion speed



>
>Here is a new topic: How fast can you do ADC conversions on a tiny26 @
16mhz
>and get 8 bit accuracy? Has anyone tried? Is it in the specs anywhere?

I'm running it at 250kHz with 8M clock, and not having a problem.
It's a little beyond the spec, but in my app, the last bit of accuracy isn't
that important.

Beware the on chip "reference".. My T26's were all around 2.7V, as opposed
to 2.5V nominal. We had to go to an external reference.





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