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"Flicker Filter" for low fuel warning float switches?

 
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nuckollsr(at)cox.net
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PostPosted: Sun Jan 22, 2006 10:01 pm    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

Some months ago, someone was asking about a circuit to
make the float-switches in their airplane be a bit more
definitive as to when the low fuel warning light was
illuminated.

I have hardware in hand that can be programmed to accomplish
this task. We can watch for switch behavior to exhibit
some characteristic like "switch closed more than 50% of the time
over a 1 minute period" before the warning light is latched
on. Given the flexibility of software, we can probably address
any other low-fuel trip protocol. Does anyone have a need for
this capability?
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
http://www.aeroelectric.com


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Mark Phillips in TN



Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

PostPosted: Mon Jan 23, 2006 6:34 am    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

In a message dated 1/23/06 12:03:50 AM Central Standard Time,
nuckollsr(at)cox.net writes:

Quote:
I have hardware in hand that can be programmed to accomplish
this task. We can watch for switch behavior to exhibit
some characteristic like "switch closed more than 50% of the time
over a 1 minute period" before the warning light is latched
on. Given the flexibility of software, we can probably address
any other low-fuel trip protocol. Does anyone have a need for
this capability?

Quote:
>>>>

I used a couple of Altronix 6062 timer boards suggested by John P. Marzluf
several years ago- they perform fine, but your solution is likely a more elegant
way to accomplish this.

Here's a message from archives:

http://www.matronics.com/searching/getmsg_script.cgi?INDEX=17746345?KEYS=outback?LISTNAME=AeroElectric?HITNUMBER=84?SERIAL=0627595069?SHOWBUTTONS=YES

and my implementation of them:

http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5003

They are the blue boards on the tray.

Would like to see what ya got in mind, Bob- probably something about the size
of a postage stamp, no doubt...

Mark Phillips


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nuckollsr(at)cox.net
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PostPosted: Mon Jan 23, 2006 7:42 am    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

At 09:33 AM 1/23/2006 -0500, you wrote:

Quote:


In a message dated 1/23/06 12:03:50 AM Central Standard Time,
nuckollsr(at)cox.net writes:

> I have hardware in hand that can be programmed to accomplish
> this task. We can watch for switch behavior to exhibit
> some characteristic like "switch closed more than 50% of the time
> over a 1 minute period" before the warning light is latched
> on. Given the flexibility of software, we can probably address
> any other low-fuel trip protocol. Does anyone have a need for
> this capability?

>>>>>

I used a couple of Altronix 6062 timer boards suggested by John P. Marzluf
several years ago- they perform fine, but your solution is likely a more
elegant
way to accomplish this.

Here's a message from archives:

http://www.matronics.com/searching/getmsg_script.cgi?INDEX=17746345?KEYS=outback?LISTNAME=AeroElectric?HITNUMBER=84?SERIAL=0627595069?SHOWBUTTONS=YES

and my implementation of them:

http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5003

They are the blue boards on the tray.

Would like to see what ya got in mind, Bob- probably something about the size
of a postage stamp, no doubt...

A little bigger than a postage stamp, but not much. See:

http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1.pdf

This is one of several products that will be supplied in this
package. The circuitry is processor based so it can be 'taught'
to do a variety of things. In the case of the AEC9011, we're
doing an LV/OV controller for the Chinese CJ6 trainer. Seems
folks are suffering some expensive OV events. The 9011 with
different software could be a flicker filter for low fuel
switches . . . and perhaps a variety of other tasks.

In a concentrated effort to increase commonality of hardware,
packaging, and fabrication techniques for a line of products,
we're going the software route as much as possible. This is
the only way I can see to keep costs down and still offer
a variety of capabilities in both stock and custom products when
the volumes are so low.

Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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nuckollsr(at)cox.net
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PostPosted: Mon Jan 23, 2006 8:56 am    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

At 09:19 AM 1/23/2006 -0600, you wrote:

Quote:

<BigD(at)DaveMorris.com> float switches?

Bob, I have a switch float in my header tank that I use to control the pump
that feeds the header. (Other Dragonfly builders manually switch the pump
on and off, watching a big red light, and install a huger overflow tube.)

I was planning to install a 1 minute timer, so that when the float
indicates a full tank, the pump switches off for 1 solid minute, before
being allowed to come on again (if the float indicates it's time to run
again). Basically a kind of debounce circuit. I think that can be done
with a simple 555 circuit or even some of the off-the-shelf timer kits from
QKits.

Dave Morris

No doubt this is true. But one of the things I've noticed is that
the majority of OBAM aircraft builders are more interested in
turn-key solutions all packaged up with nice mounting bases and
d-sub connectors on the front. It also helps if they are small
and environmentally robust.

For individuals with a hanker'n to sling some solder and build
an enclosure to hold it, there are countless variations
on a theme that will do the task.

My goal is to craft a series of low cost packages that can
be taught to do a variety of tasks so that we don't re-invent
the whole wheel for each new task. A further goal is to offer
packages that are as flight-worthy as anything I would do
for a certified a/c customer.

If successful in this endeavor, the guy who is thinking about
ordering up a bag of parts and heating up the iron will be hard
pressed to show a return on investment (beyond the entertainment/
educational value) for rolling his own when versatile, low cost,
and robust solutions are becoming almost catalog items.

Bob . . .


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Peter Laurence



Joined: 10 Jan 2006
Posts: 50

PostPosted: Mon Jan 23, 2006 12:46 pm    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

Quote:
Some months ago, someone was asking about a circuit to
make the float-switches in their airplane be a bit more
definitive as to when the low fuel warning light was
illuminated.

I have hardware in hand that can be programmed to accomplish
this task. We can watch for switch behavior to exhibit
some characteristic like "switch closed more than 50% of the time
over a 1 minute period" before the warning light is latched
on. Given the flexibility of software, we can probably address
any other low-fuel trip protocol. Does anyone have a need for
this capability?>

Bob . . .


Yes
Peter
Quote:




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KeithHallsten(at)quiknet.
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PostPosted: Mon Jan 23, 2006 8:56 pm    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

Yes, it's been an item of discussion among Velocity pilots. We have a sump
tank to which both main tanks drain, in which is installed either a float
switch or one of the "no moving parts" optical switches (see
http://www.gemssensors.com/electrooptical.htm) . It causes the pulse to
race a bit when the light flickers!

Keith Hallsten
Subject: "Flicker Filter" for low fuel warning float
switches?
From: Robert L. Nuckolls, III (nuckollsr(at)cox.net
<mailto:nuckollsr(at)cox.net?subject=Re:%20%22Flicker%20Filter%22%20for%20low%2
0fuel%20warning%20float%20switches?&replyto=5.1.0.14.2.20060122235511.0160fa
88(at)pop.central.cox.net> )
Date: Sun Jan 22 - 10:01 PM

<nuckollsr(at)cox.net
<mailto:nuckollsr(at)cox.net?subject=Re:%20%22Flicker%20Filter%22%20for%20low%2
0fuel%20warning%20float%20switches?&replyto=5.1.0.14.2.20060122235511.0160fa
88(at)pop.central.cox.net> >

Some months ago, someone was asking about a circuit to
make the float-switches in their airplane be a bit more
definitive as to when the low fuel warning light was
illuminated.

I have hardware in hand that can be programmed to accomplish
this task. We can watch for switch behavior to exhibit
some characteristic like "switch closed more than 50% of the time
over a 1 minute period" before the warning light is latched
on. Given the flexibility of software, we can probably address
any other low-fuel trip protocol. Does anyone have a need for
this capability?

Bob . . .


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michele.delsol(at)microsi
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PostPosted: Tue Jan 24, 2006 11:13 pm    Post subject: "Flicker Filter" for low fuel warning float switches? Reply with quote

You might want to look at the AE fuel guardian at www.aircraftextras.com.

I installed one in each tank of my RV8 - not flying yet.

Michele

--


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