[App_rpt-users] RTCM/chan_voter/event management subsystem

[David McGough]

Here is another simple solution, rather than using a relay, etc....Just 
use a high-efficiency DC-DC switcher that includes a logic-level 
enable/disable.  I'm using a handful of quarter-sized boards similar to 
these:

http://www.ebay.com/itm/310925788373

Here is a typical datasheet for the switching chip used:

http://tw.richtek.com/en/Products/Switching%20Regulators/DC_DC%20StepDown%20Convertor/RT8272


I attach these regulators to 3.3v or 5v logic (like a URI GPIO pin) via a
10K resistor. Pull the enable low to shut the regulator down. With 12v
fans, I typically set the output at 8v or 9v, so, it's fairly quietly 
moving air.

Simple, inexpensive and "off the shelf" available.

73, David KB4FXC


On Mon, 1 Aug 2016, Bryan D. Boyle wrote:

> is your xmtr on the rtcm or are you using voted receivers and one xmtr directly connected to a URI?
> 
> Are you running the background script that k0kn has on his website?  just because you set the gpio pins and the event subsystem sets the flag, asterisk doesn't directly flip those pins; you need a separate control script to do what you need, which is sense that the tx flag has been set (the file in /tmp), output a command to close the relay, and then unset the pin when the flag gets erased and back to idle when done.
> 
> Since hams are notoriously cheap, the circuit to control a relay with a gpio pin is on DMK's website.  About $5. in parts if you don't already have them.
> 
> google k0kn for the scripts from the source, not someone's interpretation (however well meaning, it is what HE did and may not be useful for your particular situation).
> 
> Been running k0kn's scripts to drive fans (and some other things: relay logic has a certain solid feeling to do things like turn things on and off...) since '11...hasn't failed yet.  Go to the source, and build from there.
> --
> Bryan
> Sent from my iPhone 6S...No electrons were harmed in the sending of this message.
> 
> 
> 
> > On Aug 1, 2016, at 20:57, Stephen - K1LNX <k1lnx at k1lnx.net> wrote:
> > 
> > Hey guys... I have a fan on the transmit radio, but as I don't want to run it all the time, only when transmitting, I'm going to drive a relay from a GPIO pin off of a URI instead. I found two excellent resources as a basis for what I'm after: 
> > 
> > http://www.qsl.net/k0kn/txfan
> > http://latinovoip.net/allstar-and-the-gpio-fan-script-for-dmk-engineering-uri/
> > 
> > I setup the following in my node stanza:
> > 
> > [2376]
> > events = events2376
> > 
> > [events2376]
> > touch /tmp/RPT_TXKEYED2376 = s|t|RPT_TXKEYED
> > rm -f /tmp/RPT_TXKEYED2376 = s|f|RPT_TXKEYED
> > 
> > As you can see, this is pretty simple, write RPT_TXKEYED2376 when the RPT_TXKEYED variable is true, remove when false. I even checked for the presence of those variables when the repeater is keyed/active from doing a "rpt showvars 2376":
> > 
> > as2376*CLI> rpt showvars 2376
> > Variable listing for node 2376:
> >    XX_RPT_TXKEYED=1
> >    RPT_ETXKEYED=1
> >    RPT_TXKEYED=1
> >    RPT_RXKEYED=1
> >    RPT_NUMLINKS=0
> >    RPT_LINKS=0
> >    RPT_NUMALINKS=0
> >    RPT_ALINKS=0
> >    RPT_AUTOPATCHUP=0
> >     -- 9 variables
> > 
> > Everything suggests this should work, but it is not for whatever reason, which leads me to two possible guesses: 
> > 
> > - the logic is not placed correctly where it needs to be in rpt.conf
> > - chan_voter does not talk to the event management subsystem
> > 
> > Any ideas? Kinda lost... 
> > 
> > Thanks, 
> > Stephen 
> > K1LNX
> > 
> > 
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