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nuckolls.bob(at)aeroelect
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 Posted: Wed Apr 04, 2012 9:44 am Post subject: Next generation wig-wag controller for LED lamps |
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At 06:19 PM 3/30/2012, you wrote:
| Quote: | --> AeroElectric-List message posted by: Michael Ashura <ashuramj(at)hotmail.com>
Bob, can I wire two LED landing and taxi lights per Page 3.0 (Ref DE 12/15/11) but using a single switch (already installed and labeled in unflown RV-6) as shown on Page 3.0 from 2003? Thank you |
Give me a few days on this. It occurs to me that
I've been twisting what WAS a good system for
incandescent lamps into a pretzel in search
of the elegant solution for LED lamps.
---------------------------------------
As promised, I spend some time considering the
ingredients that go into an alternative recipe
for success. I began with the following design
goals:
All solid state
Stand off 20V bus for 1 second or more
Simple switching that does NOT require progressive
transfer switch to achieve OFF/WW/ON operation
of lights.
Suitable for LED landing light fixtures
Minimum parts count.
While plying the asphalt between here and Wichita
I sifted through the pieces and parts. Here's
a first pass at the idea.
http://tinyurl.com/6t7zry2
This device could be fabricated from surface mount
parts and totally contained inside a 15-pin, d-sub
housing for an end product that looks like this.
[img]cid:7.1.0.9.0.20120404123154.01e4c560(at)aeroelectric.com.0[/img]
This circuit also lends itself to a DIY effort with
thru-hole parts mounted on a perf board.
Mike, if you already have a 2-10 switch installed,
it can be wired to function with this controller.
Bob . . .
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ashuramj(at)hotmail.com
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| Posted: Wed Apr 04, 2012 8:04 pm Post subject: Next generation wig-wag controller for LED lamps |
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Bob, thank you for the schematic. I guess this is the part where the "education" part comes in with my project. The "U" devices already have my curiosity...
BTW, how does a person see the picture where the Emacs! occurs?
Mike
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user9253
Joined: 28 Mar 2008
Posts: 1909
Location: Riley TWP Michigan
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gregmchugh
Joined: 03 Apr 2012
Posts: 42
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| Posted: Sat Apr 07, 2012 10:20 am Post subject: Re: Next generation wig-wag controller for LED lamps |
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Bob,
Thanks for the info.
What is the limiting factor on power to the LED's?
I am planning to use the Teledyne LED lights that use 45 watts, so
about 4 amps at 12 volts for each light. What changes would be
needed to up the power capability by a factor of two. Different parts?
Different packaging? Different connector? Heatsinks?
What is the frequency of the wig-wag function and how is that set
by the components? I am a software engineer so I know enough
about hardware design to be dangerous, but I am in the process
of learning more.
Greg McHugh
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enginerdy(at)gmail.com
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| Posted: Mon Apr 09, 2012 8:58 am Post subject: Next generation wig-wag controller for LED lamps |
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To that goal, I'd like to suggest using an Arduino. The IDE is totally cross-platform, the programming language is C with some extra libraries, and the only difference between an Arduino and a plain Atmel AVR micro is the (free) boot loader, giving folks their choice of Arduino or AVR Studio. Additionally there is tons of forum support for programming those guys.
I recently used one in a project where one of the goals was that it needed to be maintained by a moderately savvy high-school student. I think it's great for that kind of thing.
Daniel
On Apr 9, 2012, at 11:21 AM, "gregmchugh" <gregmchugh(at)aol.com> wrote:
| Quote: | To be useful for a wide audience there needs to be simple learning curve for developing the software
functionality and I/O configuration. I agree that the use of a PIC micro would be the way to go based on
their ready availability, good price per performance, and availability of development tools.
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gregmchugh
Joined: 03 Apr 2012
Posts: 42
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| Posted: Mon Apr 09, 2012 9:48 am Post subject: Re: Next generation wig-wag controller for LED lamps |
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Daniel,
I agree that the Arduino is a good option but, as I noted in another note
which seems to be appearing under a different thread, I would be
concerned that the learning curve for software development on
an Arduino might be too steep for many potential users. I suggested
the PICAXE micro as a good choice due to the simple learning curve. Both
are viable options but they would seem to be to be targeted at slightly
different users. The Arduino development environment makes learning
to use the C language easier than many other options but it is still
a language that takes significant learning to understand what the code is
doing. This issue is not as significant as most C development
environments, Arduino does ease the learning curve with
a nice development environment and lots of tutorials and examples.
I can see people starting out with PICAXE and moving to Arduino as
they develop more complex applications. For people ready to tackle
the added complexity of the software, Arduino is probably the best option.
It is good that many options exist...
Greg McHugh
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