peter(at)sportingaero.com
Guest
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 Posted: Fri Oct 04, 2013 11:43 am Post subject: Dual voltage output from fuel quantity senders |
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> 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?
Perhaps nothing!! I just don't know very much about analogue
electronics. If I could avoid the Arduino that would be great. I will
find out about what the EFIS is expecting and try to characterise the
steam gauge as Bob suggested. It may take a few days, but thanks both
for the pointers.
Peter
On 04/10/2013 19:13, Eric M. Jones wrote:
| 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
> 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?
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=409857#409857
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