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Dual voltage output from fuel quantity senders

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peter(at)sportingaero.com
Guest

Posted: Thu Oct 03, 2013 12:26 pm Post subject: Dual voltage output from fuel quantity senders

I have 2 fuel gauges in my airplane that work on 12v and 5v, and only 

one (resistance type) sender. I am trying to figure out how to get both 

gauges to work and be accurate. The 12v gauge is a straight analogue 

device with a pointer. The 5v gauge is part of an EFIS. At present I am 

using the analogue gauge only and the EFIS is continually upset at 

having no fuel quantity input.



I have looked into a solution using an Arduino, sampling the data in 

doesn't seem to be too difficult, using the analogue input and a voltage 

divider circuit to drop the input voltage. I think I can get the Arduino 

to drive something like a MCP41100 8 bit dual digital potentiometer as 

an output device, with the 2 channels one for each of the 12v & 5v 

circuits. However these devices work at 5v and low current.



So my question to the smart people here is how to I use the output of 

these digipots to look to the gauges as though they are a 30-240 ohm 

fuel quantity sender?



Regards, Peter

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billp(at)wwpc.com
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Posted: Fri Oct 04, 2013 7:11 am Post subject: Dual voltage output from fuel quantity senders

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Fri Oct 04, 2013 10:13 am Post subject: Re: Dual voltage output from fuel quantity senders

 	  Quote: 	
		  I have 2 fuel gauges in my airplane that work on 12v and 5v, and only 

one (resistance type) sender. I am trying to figure out how to get both 

gauges to work and be accurate. The 12v gauge is a straight analogue 

device with a pointer. The 5v gauge is part of an EFIS. At present I am 

using the analogue gauge only and the EFIS is continually upset at 

having no fuel quantity input. 



I have looked into a solution using an Arduino, sampling the data in 

doesn't seem to be too difficult, using the analogue input and a voltage 

divider circuit to drop the input voltage. I think I can get the Arduino 

to drive something like a MCP41100 8 bit dual digital potentiometer as 

an output device, with the 2 channels one for each of the 12v & 5v 

circuits. However these devices work at 5v and low current. 



So my question to the smart people here is how to I use the output of 

these digipots to look to the gauges as though they are a 30-240 ohm 

fuel quantity sender? 



Regards, Peter 	




 	  Quote: 	
		  sampling the data in doesn't seem to be too difficult, using the analogue input and a voltage divider circuit to drop the input voltage 	




So Peter, why not run that output into the Efis? Or if this won't do, then reduce the 12V ratiometric voltage with an op amp. I think your approach is getting way too complicated to start adding an Arduino.



What am I missing?

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

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