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03-24-2016, 03:14 PM
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Join Date: Dec 2009
Location: Montreal
Posts: 1,456
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long live experimental aviation!
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Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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03-24-2016, 08:52 PM
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Join Date: Feb 2016
Location: Knoxville, TN
Posts: 26
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Quote:
Originally Posted by kamikaze
I want to hear about the underlying software!
Linux core? Some other RTOS? What kind of bus is it? CANBus presumably, but configured how? Industrial-rated components or better? C, C++, ADA, other?
Is the EFIS board COTS? Which one?
If you want to take this "commercial", I certainly hope the experimental kit model of plans & parts would be how it could be sold ... though of course there's the software question ... I think OSS + plans & kits hardware would be a neat way to go ...
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JF,
it's currently running under XP Embedded. This was just to get things up and running, and allows for an easy port to CE. All software is written in C. Hardware is an industrial Atom N455 in PC/104 form factor, mounted on the main EFIS board which uses Microchip MCU's for CAN, PWM (brightness), debouncing hardware, level converters (RS-422) etc.
CAN bus is running at 250kb/s. Not sure what you mean by "configured" -- with 20ppm clocks and <1m node lengths, the tq/segment setup is simple. A higher level ACK/NAK protocol is used for critical messages, but most are not, so they are just fired off "one-way".
- Ebbe
__________________
RV-7A, purchased from builder
IO-360, ~450 hrs
Avionics: own design
KMMI - Athens, TN
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03-24-2016, 09:18 PM
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Join Date: Feb 2016
Location: Knoxville, TN
Posts: 26
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Quote:
Originally Posted by petehowell
I am at KANE up north and would love to see your setup! Thinking about doing it is one thing, DOING it is a whole 'nother level.
Great work!
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Hi Pete,
Just shoot me an email when you are ready to come down to Fleming. I'm at the north end of the field, right behind the beacon. There most weekends.
- Ebbe
__________________
RV-7A, purchased from builder
IO-360, ~450 hrs
Avionics: own design
KMMI - Athens, TN
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03-24-2016, 09:22 PM
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Join Date: Feb 2016
Location: Knoxville, TN
Posts: 26
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Quote:
Originally Posted by BobTurner
Have you thought of tackling building a GPS navigator that meets the TSO (I think it's 145/146?) requirements for IFR use? There's a real market there for the right box at the right price.
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Bob,
Help may be on the way. The more I read about it, the more doable it sounds. Another good challenge, not that I need it....
- Ebbe
__________________
RV-7A, purchased from builder
IO-360, ~450 hrs
Avionics: own design
KMMI - Athens, TN
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03-25-2016, 05:43 AM
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Join Date: Jun 2014
Location: Ottawa, ON, Canada
Posts: 353
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Quote:
Originally Posted by Ebbe
JF,
it's currently running under XP Embedded. This was just to get things up and running, and allows for an easy port to CE. All software is written in C. Hardware is an industrial Atom N455 in PC/104 form factor, mounted on the main EFIS board which uses Microchip MCU's for CAN, PWM (brightness), debouncing hardware, level converters (RS-422) etc.
CAN bus is running at 250kb/s. Not sure what you mean by "configured" -- with 20ppm clocks and <1m node lengths, the tq/segment setup is simple. A higher level ACK/NAK protocol is used for critical messages, but most are not, so they are just fired off "one-way".
- Ebbe
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Windows! That's an option ... licensing costs however (They don't seem to sell licenses through their store also) ... but does simplify things greatly ... My efforts in this area have been focused on sticking with "openness" (Linux on Intel with open-source everything) ... it's been a challenge but I am getting closer. Finding a board that does everything COTS is also a challenge. but i did find ways to use PC/104 with the right daughter boards ... not sure how such a setup will endure shock/vibrations though ...
I was wondering whether you used "real-time" canbus (Forget the spec right now ...) ... but looks like no one really bothers.
Anyways, very nice ... that's a whole lot of time spent away from your actual build also ... or was the plane already built when you undertook this challenge?
__________________
J.F.
Sling 4 empennage kit on order!
Future EAA 245 Member (Hopefully)
Current Piper Warrior PA-28-151 Owner/Pilot
Ottawa, Ontario, Canada
http://www.sling4.ninja
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03-25-2016, 07:52 AM
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Join Date: Jun 2014
Location: Ottawa, ON, Canada
Posts: 353
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On a different note, I really like the airliner like PFD/MFD/EICAS-like layout ... the screens are far less cluttered ... but it's a tight fit!
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J.F.
Sling 4 empennage kit on order!
Future EAA 245 Member (Hopefully)
Current Piper Warrior PA-28-151 Owner/Pilot
Ottawa, Ontario, Canada
http://www.sling4.ninja
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03-25-2016, 08:01 AM
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Join Date: Mar 2006
Location: SoCal
Posts: 626
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CAN bus
Quote:
Originally Posted by kamikaze
I was wondering whether you used "real-time" canbus (Forget the spec right now ...) ... but looks like no one really bothers.
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Not so, I have benn flying with a distributed power,trim and flap system for the last few years based on CAN. AIRINC 825 and CANaerospace specs are out there.
Here is the paper I presented at Osh a few years back.
http://jadsystems.com/CANaerospace_OSH_2009_Paper.pdf
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JD
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RV-7 N314SY (KWHP)
IO-360-B1B
CANbus based trim/flaps and electrical
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03-25-2016, 08:04 AM
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Join Date: Aug 2005
Location: Mendon South Carolina
Posts: 1,391
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I contemplated building my own avionics once but gave up when I couldn't find enough vacuum tubes.

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Milt Concannon
Last edited by N395V : 03-25-2016 at 08:10 AM.
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03-25-2016, 08:09 AM
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Join Date: Jan 2005
Location: Ottawa, Canada
Posts: 2,357
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Wow! You've certainly raised the bar on designing your own panel
How well does the AHRS work? Do you use pitot/static or GPS inputs to stabilize the attitude algorithm, or does it manage to maintain stability without any assistance? How well does it realign in flight, if needed?
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03-25-2016, 08:46 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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dude! that's impressive. I bought a PLC display a year ago so that I could make an engine monitor but it's been on the back burner. I think there is some opportunity here for the experimental group to benefit.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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