If you are really concerned that a relay will "wear out" in your lifetime, then just buy an adjustable fan switch (close on rise) from Grainger. They have different models with different temperature ranges, but I suggest an adjustable one.

They are $8.00

You can control a 12v or 110v fan with these. Stick it to the heatsink of the PA and it will come on when it gets hot, and shut off when it has cooled down.

If you insist on trying to control a fan via GPIO (on with PTT and off when no PTT) then your heatsink will never cool down if your repeater is popular.
If you build the recommended circuit from DMK, you can add a 555 timer to it to give it some shut off delay if you want. But then, it's gonna cost you more than the cheap fan switch from Grainger.

But wait, there are no hobbyists anymore that build anything from their parts bins. Sorry I suggested that!
Go get one from Grainger.....
You only have to splice it into one wire...how hard can that be?

On Thu, Jan 26, 2012 at 9:00 AM, <app_rpt-users-request@ohnosec.org> wrote:
Send App_rpt-users mailing list submissions to
       app_rpt-users@ohnosec.org

To subscribe or unsubscribe via the World Wide Web, visit
       http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
or, via email, send a message with subject or body 'help' to
       app_rpt-users-request@ohnosec.org

You can reach the person managing the list at
       app_rpt-users-owner@ohnosec.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of App_rpt-users digest..."


Today's Topics:

  1. WebTransceiver stopped working (Michael J. Wolthuis)
  2. Re: WebTransceiver stopped working (Jim Duuuude)
  3. Figured it out with web transceiver (Michael J. Wolthuis)
  4. Re: GPIO fan control (K&R Yoksh)
  5. Re: GPIO fan control (Tim Sawyer)


----------------------------------------------------------------------

Message: 1
Date: Wed, 25 Jan 2012 17:33:52 -0500
From: "Michael J. Wolthuis" <wolthui3@msu.edu>
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] WebTransceiver stopped working
Message-ID: <4F208350.9080204@msu.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I have not made any changes to my node recently, but suddenly
WebTransceiver has stopped connection.  It was working fine, and the
rest of the node seems ok.

This is for node ast28241.  The config files are downloaded from the
portal and have Webtransceiver enabled.  I confirmed UDP port 4569 open
though my firewall to the system.

Any other suggestions where to look?

I can connect with iaxrpt fine via the gui user.

Mike
kb8zgl



------------------------------

Message: 2
Date: Wed, 25 Jan 2012 15:55:56 -0800
From: Jim Duuuude <telesistant@hotmail.com>
To: <wolthui3@msu.edu>, app_rpt mailing list
       <app_rpt-users@ohnosec.org>
Subject: Re: [App_rpt-users] WebTransceiver stopped working
Message-ID: <BLU155-W2432EA5FC9C1E5206E7C5B1880@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"


works fine for me

> Date: Wed, 25 Jan 2012 17:33:52 -0500
> From: wolthui3@msu.edu
> To: app_rpt-users@ohnosec.org
> Subject: [App_rpt-users] WebTransceiver stopped working
>
> I have not made any changes to my node recently, but suddenly
> WebTransceiver has stopped connection.  It was working fine, and the
> rest of the node seems ok.
>
> This is for node ast28241.  The config files are downloaded from the
> portal and have Webtransceiver enabled.  I confirmed UDP port 4569 open
> though my firewall to the system.
>
> Any other suggestions where to look?
>
> I can connect with iaxrpt fine via the gui user.
>
> Mike
> kb8zgl
>
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users@ohnosec.org
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ohnosec.org/pipermail/app_rpt-users/attachments/20120125/c339e4bd/attachment-0001.html>

------------------------------

Message: 3
Date: Wed, 25 Jan 2012 21:37:13 -0500
From: "Michael J. Wolthuis" <wolthui3@msu.edu>
To: <app_rpt-users@ohnosec.org>
Subject: [App_rpt-users] Figured it out with web transceiver
Message-ID: <04da01ccdbd3$699ad940$3cd08bc0$@msu.edu>
Content-Type: text/plain; charset="us-ascii"

I think the problem is my local router.  It doesn't appear  to allow me to
NAT out and back in.  The node was on the same IP as I was on trying to use
web transceiver.  As soon as I changed my computer to NAT out a different IP
address things worked fine.



Thanks for all the ideas and assistance,

Mike

Kb8zgl



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ohnosec.org/pipermail/app_rpt-users/attachments/20120125/6f9e2869/attachment-0001.html>

------------------------------

Message: 4
Date: Wed, 25 Jan 2012 22:20:47 -0600
From: "K&R Yoksh" <yokshs@gmail.com>
To: <app_rpt-users@ohnosec.org>
Subject: Re: [App_rpt-users] GPIO fan control
Message-ID: <8A51F56D0C83480B9E9928A058ACC051@main>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
       reply-type=original


Hello all,

I considered doing this on my nodes, but didn't want to have a relay or fan
wear out by cycling on each PTT. I tried using the
connpgm and discpgm in rpt.conf to enable the fan during connections, and
disable afterwards, but it was not very effective.

I'd really like to find a fan control script like what I used on EchoIRLP...
Something that activates by PTT, and keeps the fan going for X seconds
afterwards..

I have multiple GPIO lines available on my parallel port, and still have the
fan control hardware that I built for my EchoIRLP station here. At this
point,
the fan is just running 24 x 7.

Maybe someone can come up with such a script? My bash is pretty crude.

73

Kyle
K0KN


--- Original Message ---

>> Has anyone used the GPIO lines on a URI to active a 12 volt DC fan when
> the PTT is active?
>> I have a friend that who wants to implement this on his All-star node to
> keep his transmitter cool.
>> I guess that we would need to use a relay with the GPIO line to protect
> the URI?
>> Any thoughts or suggestions?
>> Marshall - ke6pcv
>
> Marshall,
>
> I had the same idea and I contacted David Kramer at DMK Engineering
> (makers
> of the URI).
> He responded with this link on how to do exactly what you want;
>
> http://www.dmkeng.com/images/GPIO_Relay.pdf
>
> I tried it and it works great....
>
> 73,
> Neil
> WA5JXY



------------------------------

Message: 5
Date: Wed, 25 Jan 2012 21:19:40 -0800
From: Tim Sawyer <tim.sawyer@me.com>
To: K&R Yoksh <yokshs@gmail.com>
Cc: app_rpt-users@ohnosec.org
Subject: Re: [App_rpt-users] GPIO fan control
Message-ID: <BB8FE6DB-E9A0-4745-AA28-75D5028C43CA@me.com>
Content-Type: text/plain; CHARSET=US-ASCII

It should be possible to set a bit on the parallel port which follows PTT with the events management system.

see http://ohnosec.org/drupal/node/176

I've not tried this but something like this might work:

In rpt.conf
events=events
[events]
cop 62, PP03 = c|e|${RPT_TXKEYED}

A USB node would be needed with a PP03 = out0 in the chan config:
In simpleusb.conf or usbradio.conf
PP03 = out0

--
Tim
:wq

On Jan 25, 2012, at 8:20 PM, K&R Yoksh wrote:

>
> Hello all,
>
> I considered doing this on my nodes, but didn't want to have a relay or fan wear out by cycling on each PTT. I tried using the
> connpgm and discpgm in rpt.conf to enable the fan during connections, and disable afterwards, but it was not very effective.
>
> I'd really like to find a fan control script like what I used on EchoIRLP... Something that activates by PTT, and keeps the fan going for X seconds afterwards..
>
> I have multiple GPIO lines available on my parallel port, and still have the fan control hardware that I built for my EchoIRLP station here. At this point,
> the fan is just running 24 x 7.
>
> Maybe someone can come up with such a script? My bash is pretty crude.
>
> 73
>
> Kyle
> K0KN
>
>
> --- Original Message ---
>
>>> Has anyone used the GPIO lines on a URI to active a 12 volt DC fan when
>> the PTT is active?
>>> I have a friend that who wants to implement this on his All-star node to
>> keep his transmitter cool.
>>> I guess that we would need to use a relay with the GPIO line to protect
>> the URI?
>>> Any thoughts or suggestions?
>>> Marshall - ke6pcv
>>
>> Marshall,
>>
>> I had the same idea and I contacted David Kramer at DMK Engineering (makers
>> of the URI).
>> He responded with this link on how to do exactly what you want;
>>
>> http://www.dmkeng.com/images/GPIO_Relay.pdf
>>
>> I tried it and it works great....
>>
>> 73,
>> Neil
>> WA5JXY
>
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users@ohnosec.org
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users



------------------------------

_______________________________________________
App_rpt-users mailing list
App_rpt-users@ohnosec.org
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users


End of App_rpt-users Digest, Vol 35, Issue 46
*********************************************