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Dynon 180

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avgashead(at)btinternet.c
Guest

Posted: Fri May 08, 2009 10:09 pm Post subject: Dynon 180

Apologies for tagging onto this thread, but has anybody out there had any

experience with connecting capacitance probes to a dynon 180?

The Dynon requires a 0-5 volt varying input and the probes are capacitance

type from Pete at Airworld ie resistive type. Dynon have advised their

resistance to voltage converter is not suitable and Pete says dynon should

know?!



I know some of you are worldly wise in the electrics side and might have

encountered this one and I don't want additional analogue gauges. 

Any advice would be appreciated

Richard S



#103 mono nearly ready to fly



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Rowland_Carson

Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England

Posted: Fri May 08, 2009 11:52 pm Post subject: Dynon 180

At 2009-05-09 07:07 +0100 Richard Scanlan wrote:



 	  Quote: 	
		  The Dynon requires a 0-5 volt varying input


	


Richard - OK, that's clear enough, and you can generate that 0-5 

volts in a number of ways, typically by using a potentiometer 

(variable resistor network).



 	  Quote: 	
		  the probes are capacitance

type from Pete at Airworld ie resistive type


	


But that's not very clear. Either they are capacitive or resistive. 

Maybe their sensing mechaism is capacitive and the interface to the 

display is resistive? You don't seem to say what this sensor is 

intended to measure.



 	  Quote: 	
		  Dynon have advised their

resistance to voltage converter is not suitable


	


If the output of the sensors is capacitive then that would be a 

sensible answer. Even if the sensor output is resistive, it might 

also be correct if the range of resistance falls outside what the 

Dynon converter is designed to handle. Do you have the spec of the 

Dynon converter?



 	  Quote: 	
		  I know some of you are worldly wise in the electrics side


	


I have done a bit of electronics, but I'd need a bit more information 

before being able to offer advice.



The sensor in question, how is it specified? Assuming it's a 

2-terminal device, I'm looking for the range of capacitance (or 

resistance as the case may be) that it presents to the outside world 

for the full range of input conditions. It does seem much more likely 

that the output is resistive - a variable capacitance would require 

rather more interface work - so the spec would be something like: X 

ohms at minimum (pressure, temperature, level, whatever) to Y ohms at 

maximum (pressure, temperature, level etc).



If it's a simple 2-terminal variable resistor, we can design a 

potentiometer circuit to provide the Dynon with the 0 - 5 volts that 

it wants to see, provided also that the Dynon input impedance is 

known (or alternatively is so high that is can be neglected).



The approach above is from first principles, without knowing very 

much about the devices involved. Maybe someone with direct experience 

of the sensor and the display can offer more succint advice.



I've removed the rest of the text from this hijacked thread as it's 

not relevant!



regards



Rowland

-- 

| Rowland Carson  LAA #16532    http://home.clara.net/rowil/aviation/

| 1270 hours building Europa #435 G-ROWI  e-mail <rowil(at)clara.net>

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simon.a.smith(at)mac.com
Guest

Posted: Sat May 09, 2009 12:21 am Post subject: Dynon 180

I take it that you are talking about fuel level sensors.  The Dynon  

website says:



Dynon Avionics does not supply fuel quantity senders. However, our  

EMSes and FlightDEK-

D180 are compatible with any resistive "float" style fuel level  

sender, or capacitance probes

that output a variable voltage between 0-5V DC.



and



Capacitance to Voltage Converter

These converters allow Vans RV builders with capacitive plates in  

their fuel tanks to measure

fuel quantity with Dynon’s EMS products. One is required per tank; a  

maximum of two are

supported. Each is equipped with a BNC connector, making connection to  

the Vans plates a

snap.



Remember that Capacitance fuel sensors need calibrating for the fuel  

type in use.  A probe calibrated for Avgas will miss read with Mogas  

and vice-versa.



Europa do a resistive probe that does work with the D180 (I have one).



cheers



Simon

On 9 May 2009, at 07:07, Richard Scanlan wrote:



[quote] 

 >

 Apologies for tagging onto this thread, but has anybody out there  

 had any

 experience with connecting capacitance probes to a dynon 180?

 The Dynon requires a 0-5 volt varying input and the probes are  

 capacitance

 type from Pete at Airworld ie resistive type. Dynon have advised their

 resistance to voltage converter is not suitable and Pete says dynon  

 should

 know?!



 I know some of you are worldly wise in the electrics side and might  

 have

 encountered this one and I don't want additional analogue gauges.

 Any advice would be appreciated

 Richard S



 #103 mono nearly ready to fly



 --

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jrgowing(at)bigpond.net.a
Guest

Posted: Sat May 09, 2009 2:22 am Post subject: Dynon 180

Richard



Tony Krzyzewski has updated his fuel gauge and has provided me with a list 

of electronic parts to connect it to Dynon.

However I don't think the actual circuit has been provided so far in his 

diagrams; but obviously he knows how to do it and it may only be necessary 

to ask him - as I will also h ave to do.



JR (Bob) Gowing UK Kit 327 in Oz

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tonyk(at)kaon.co.nz
Guest

Posted: Sat May 09, 2009 8:41 pm Post subject: Dynon 180

My version 5 sender and and associatedated display chip are capable of outputting a 0-5v level that emulates a capacitance gauge.



Those with the v5 circuit diagram will find the dynon interface circuit on the display chip page. As the extra circuitry consists of one resistor and one capacitor it is a really easy add on.



Regards



Tony



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

Sent from Tony's mobile phone 

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



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tonyk(at)kaon.co.nz
Guest

Posted: Sat May 09, 2009 8:41 pm Post subject: Dynon 180

My version 5 sender and and associatedated display chip are capable of outputting a 0-5v level that emulates a capacitance gauge.



Those with the v5 circuit diagram will find the dynon interface circuit on the display chip page. As the extra circuitry consists of one resistor and one capacitor it is a really easy add on.



Regards



Tony



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

Sent from Tony's mobile phone 

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



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tonyk(at)kaon.co.nz
Guest

Posted: Sat May 09, 2009 8:41 pm Post subject: Dynon 180

The westach capacitance gauges with integral electronics output 0-5v which is compatible with the dynon input.



Tony



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

Sent from Tony's mobile phone 

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



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avgashead(at)btinternet.c
Guest

Posted: Sat May 09, 2009 11:08 pm Post subject: Dynon 180

Thatâ€™s great Tony, something was telling me to get up and pick up my mail this morning!!



A direct connection to the Dynon makes sense. I will feed some power into it remotely and check its output with a meter before I connect it up, but hopefully I can finalise that part of the wiring.



Thanks everybody else for your input, a little help from the forum can save a lot of head scratching.



Richard 



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