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"Flicker Filter" for low fuel warning float switches?

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nuckollsr(at)cox.net
Guest

Posted: Sun Jan 22, 2006 10:01 pm Post subject: "Flicker Filter" for low fuel warning float switches?

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

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

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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_________________
From The PossumWorks...

nuckollsr(at)cox.net
Guest

Posted: Mon Jan 23, 2006 7:42 am Post subject: "Flicker Filter" for low fuel warning float switches?

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
Guest

Posted: Mon Jan 23, 2006 8:56 am Post subject: "Flicker Filter" for low fuel warning float switches?

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

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

 	  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.
Guest

Posted: Mon Jan 23, 2006 8:56 pm Post subject: "Flicker Filter" for low fuel warning float switches?

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
Guest

Posted: Tue Jan 24, 2006 11:13 pm Post subject: "Flicker Filter" for low fuel warning float switches?

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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