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air.peter(at)googlemail.c
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 Posted: Mon Jun 05, 2017 8:18 am Post subject: AW: AW: Automatic header tank filling |
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Thanks Bob,
I will go first with the analog comparator approach - having the relevant
voltages confirmed I will get the µc ordered. BTW - what would be the price
?
Looking on the schematic - at least to the comparator one - there is no
hysteresis - right ? Iaw - the pump runs "all the time" the full limit is
not reached.
Will the µc one have such a hysteresis in the SW ?
Br
Peter
-----Ursprüngliche Nachricht-----
Von: owner-aeroelectric-list-server(at)matronics.com
[mailto:owner-aeroelectric-list-server(at)matronics.com] Im Auftrag von C&K
Gesendet: Sonntag, 4. Juni 2017 18:18
An: aeroelectric-list(at)matronics.com
Betreff: Re: AW: Automatic header tank filling
That surprises me. Even in my high wing aircraft the header tank vents back
to a main tank in the wing Ken
On 04/06/2017 9:21 AM, Robert L. Nuckolls, III wrote:
| Quote: | At 09:01 PM 6/2/2017, you wrote:
>>
>> Also there is a drain (standard for Lancair header tanks) in case
>> you overfill – it just goes overboard.
>>
>> Would you mind sharing the schematic you already invented ?
>>
>> Thanks in advance,
>>
>> Peter
>
Here's a couple of approaches to a fuel
transfer controller applicable to your
project.
http://tinyurl.com/yc4754vw <http://tinyurl.com/yc4754vw>
The first page shows ship's wiring for
power, switch, relay, pump and over-fill
warning light.
The second page illustrates a micro-controller
based control module. Input signal voltage
from the fuel gate is watched. The pump and
warning light are activated based on numbers
stored in the uC memory at the time software
is loaded to the controller. This is the
lowest parts count approach and very compact.
All the electronics would fit into the backshell
of a 15-pin d-sub connector.
The third page illustrates an analog comparator
approach to the same task. Potentiometers allow
you to 'tune' the switch points for pump operation
and illumination of the warning light.
In both cases, the warning light can be left
out if deemed unnecessary. Page 3 lends itself
to a DIY approach. If fuel gage voltages are
known, the uC approach would also work as a DIY
project. We can supply the uC with the target
voltages in situ. Those values are easily altered
as experience dictates. Just order up another chip
with revised calibration. The 'bad' chip isn't even
worth returning . . . they're about 80 cents.
Bob . . .
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nuckollsr
Joined: 24 Mar 2009
Posts: 95
Location: Medicine Lodge, KS
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| Posted: Mon Jun 05, 2017 11:16 am Post subject: Re: AW: AW: Automatic header tank filling |
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You can have the uC . . . need feedback on your success/problems.
There is hysteresis on both comparators. Those values are not calculated . . . I can expand on that now that I know which way you want to go. It would help to know the target switching voltages . . . does your cap-fuel gage span 0-5 volts for empty-full?
That uC version is compatible with my 'do-lots' board layout designed to fit into the d-sub back shell.
http://www.aeroelectric.com/Catalog/AEC/9024/9024_FOOTPRINT.pdf
So once you've deduce the voltages for fill and overfill, we'll be able to supply a ready-to-install control module . . . you can be the beta-test airframe.
My office computer boot-drive went TU this morning. I'm scrambling around to be a new drive installed . . . old COA is illegible . . . will have to order a new one off eBay . . . at the same time, Nvidia ap on Dr. Dee's computer refuses to talk to the third monitor . . . #$%#$*!!! . . . ain't 'lectronics wunderful?
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