Today's Message Index:
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1. 05:01 AM - What did you do with your europa this week - 10/03/24 (Area-51)
2. 05:24 AM - Microbial growth in fuel tank (JonathanMilbank)
3. 08:55 PM - iLevil send RS232 Icarus to GTX327 (phillik747)
Message 1
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| Subject: | What did you do with your europa this week - 10/03/24 |
This week involved a trip to the field where the left hand hatch was opened to
grab some recording gear to try out the new gopro; then a trip backhome. Weather
has not been great for enjoyable flying.
In the shed I sat down with the semi dismantled 914 and thought about the seized
wastegate and gave a slight sigh as I decided to pull the alternator bell off
and bring that back to operational standard. Then attention was turned back
to the wastegate. So with a mighty 14" shifter I once again set forth to put
some wiggles onto the actuator arm without snapping the shaft; I was not hopeful
knowing the unit had sat idle for some 20 years or so. After a few goes with
some tension and a few months soaking in Rostoff and diesel the shaft presented
a tiny click; which was very exciting, and enough to inspire an hour of gentle
patient work freeing the rest of the crud off to end with a perfectly operating
wastegate once more.
Next task will be dressing up the valve seats on the cylinder heads and fitting
a new set of valve springs.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513372#513372
Message 2
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| Subject: | Microbial growth in fuel tank |
A friend has found evidence of microbial growth in a wing fuel tank, and he's asked
me for advice. Unfortunately I can't think of anything other than removing
and flushing the tank, possibly also using a biocide. Does anyone in the Europa
community have suggestions, please.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513373#513373
Message 3
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| Subject: | iLevil send RS232 Icarus to GTX327 |
Well, I'm excited to discover that I have successfully been able to send the pressure
altitude reading received from the iLevil 3 AP to the Garmin GTX327 transponder.
As you probably know, the GTX327 accepts altitude messages over RS232
from a Garmin 480, RS232 from fuel/air Data Computer (if configured with ALT),
gray code, Icarus, or Shadin.
Looking into the Icarus format, it was very easy to send over my computer's serial
cable using Putty. This gave me the idea that if I could get pressure alt
from a source, I could then convert that to Icarus format and send it over RS232.
I chose the Raspberry Pi Pico to be the 'handler' of this conversation. It
has two serial interfaces that communicate on RS232.
I was hesitant to purchase the iLevil3 due to no information about the output and
was considering using an MGL Blaze just for a backup/altitude encoder. I did
some testing and discovered there are many options for data output on the iLevil,
one being 'Data output.' I connected this pin to my RX port on my computer's
serial cable and started to receive binary data. Not easy to read but knew
it had some good info. A quick email to Levil gave me the information needed
to decode the protocol and find the pressure altitude. Armed with this knowledge,
I wrote a program in Python 3 to read the iLevil data and store the pressure
alt as a variable. Then the program converts that to Icarus format (ALT 12345r)
and sends it to the GTX327.
Also, the iLevil3 (with the GPS upgrade) works with the EchoUAT as a GPS source.
Right now I'm trying to determine the protocol the EchoUAT uses to populate
the pressure altitude over RS232 on COM1. I'm guessing it's GLD90, but not sure
of the message ID or framing.
Other thoughts are with being able to 'export' the live data from the iLevil3,
you can run other instruments like a digital display for ground speed, etc. I
hope this is helpful for someone. Please message/email me if you have any questions.
In this photo from left to right, first is the ground (connected to both sender
and receiver), the middle is the TX to the GTX327, left is the RX from the iLevil3.
Here, you can observe the pressure altitude at 515 feet. I've observed that on
the GTX327, the output is also in Icarus format, rounded, but I'm not certain
about the resolution without conducting further testing. I can readily adjust
the program to match this format, but currently, it's reflecting the resolution
that the iLevil is transmitting (1 foot).
--------
Kyle
Europa Tri-gear (under construction)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513375#513375
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