Today's Message Index:
----------------------
1. 06:55 AM - Re: Two power signals, one wire (Eric M. Jones)
2. 07:19 AM - Re: Two power signals, one wire (Eric Page)
3. 02:15 PM - Re: Microphone Question (Robert L. Nuckolls, III)
4. 02:36 PM - Re: Two power signals, one wire (Robert L. Nuckolls, III)
5. 02:40 PM - Re: Electronic Ignition Competitive Comparison (Robert L. Nuckolls, III)
6. 03:50 PM - Re: Two power signals, one wire (Eric Page)
7. 04:30 PM - Re: Two power signals, one wire (Justin Jones)
8. 05:02 PM - Re: Two power signals, one wire (Robert L. Nuckolls, III)
9. 06:42 PM - Re: Speaking of battery issues... (Robert L. Nuckolls, III)
10. 07:11 PM - Re: Electronic Ignition Competitive Comparison (Jeff B.)
11. 09:56 PM - Re: Electronic Ignition Competitive Comparison (H. Marvin Haught Jr)
Message 1
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| Subject: | Re: Two power signals, one wire |
The answer is an emphatic NO and YES.
NO: You really don't want to do it.
YES:
See: wikipedia.org/wiki/1-Wire#Example_communication_with_a_device
Or you can use phases where one phase is the beacon and the other the light. (This
could cause severe difficulties on the ground plane.) Imagine an alternator
with a blown diode, or no blown diodes. The remote logic can detect this and
act accordingly.
Modern cars use one power wire which is driven by a CAN communication bus that
is made for this purpose. There are also older and trickier methods that can use
the time when the beacon is off to charge a cap that runs the tail light. But
you still need communication.
There are several wireless control transmitters like Zigbee etc.
There are ways to use one wire for power and signal the remote electronics by a
short pulse, which indexes the logic by a rotary selector or its electronic equivalent
(some pinball machines had something similar).
--------
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=430291#430291
Message 2
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| Subject: | Re: Two power signals, one wire |
I also saw a method recently that put a micro-controller at the receiving end of
a 5.7V rail. Power for the micro went through a diode to a large cap on the
power pin. A digital input was connected to the power rail through another diode,
with a pull-down resistor. Power could be cycled low briefly to signal
the digital pin without resetting the micro. With a large enough cap on Vcc,
I suspect you could conduct one-way serial comms this way.
Eric
On Sep 10, 2014, at 6:53 AM, "Eric M. Jones" <emjones@charter.net> wrote:
> The answer is an emphatic NO and YES.
Message 3
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| Subject: | Re: Microphone Question |
At 08:12 PM 8/29/2014, you wrote:
>Hello Bob,
>
>Haven't heard from you in a while, so I thought I'd check in. Have
>you had an opportunity to look at the mic?
>
>Kevin
Got the first-article assembled . . . but I need to
put the fun-stuff down for a bit and do something to
keep the boss happy.
Emacs!
Might get to power it up later tonight but tomorrow for sure.
Bob . . .
Message 4
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| Subject: | Re: Two power signals, one wire |
At 09:18 AM 9/10/2014, you wrote:
>
>I also saw a method recently that put a micro-controller at the
>receiving end of a 5.7V rail. Power for the micro went through a
>diode to a large cap on the power pin. A digital input was
>connected to the power rail through another diode, with a pull-down
>resistor. Power could be cycled low briefly to signal the digital
>pin without resetting the micro. With a large enough cap on Vcc, I
>suspect you could conduct one-way serial comms this way.
There was a chap at OSH a number of years back who
was proposing a kind of 'remote controlled bus' where
a single wire might run from the main bus to another
distribution point in the wing where power would
split off to several accessories under the control
of a micro-controller on the panel that spoke to another
controller at the end of the extension feeder.
He was using a kind of line-carrier technology not
unlike the X10 house control systems . . . or FM
radio intercom systems that communicated with each
other over the power lines.
This can be done . . . but at no trivial bill of
materials. I.e., parts count really jumps and
FMEA suffers when you place several of the ship's
functions under the influence of one part.
Of course, the BIG guys have been doing instrumentation,
command, monitoring and control over data busses for
a long time.
The short answer is, you CAN do such a thing. Aside
from meeting a technical challenge for having accomplished
it . . . how did it affect system reliability?
Bob . . .
Message 5
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| Subject: | Re: Electronic Ignition Competitive Comparison |
At 06:18 PM 9/9/2014, you wrote:
>With much talk about the EFII system by Robert Paisley here lately,
>I thought I would share the results of a test between the EFII
>system, a Slick Magneto, the Pmag 114, and the Lightspeed Plasma II+ systems.
>
><http://www.flyefii.com/ignition/ignition_comparison.htm>http://www.flyefii.com/ignition/ignition_comparison.htm
>
>
>Bob, I am interested in your thoughts on this test.
Thanks for the heads-up on this. It will take some
time to study the piece . . . but I will get back
to you . . .
Bob . . .
Message 6
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| Subject: | Re: Two power signals, one wire |
On Sep 10, 2014, at 2:33 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
> This can be done . . . but at no trivial bill of materials. I.e., parts count
really jumps and FMEA suffers when you place several of the ship's functions
under the influence of one part.
>
> [SNIP]
>
> The short answer is, you CAN do such a thing. Aside from meeting a technical
challenge for having accomplished it . . . how did it affect system reliability?
>
> Bob . . .
Indeed. I'd imagine the simplest and most reliable fix for the original poster
on this thread would be to use the existing single wire as a fish tape to pull
in two new wires.
Eric
Message 7
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| Subject: | Re: Two power signals, one wire |
There must be a simple way to accomplish this. Surefire flashlights have one switch
with different "modes" such as dim, bright and flash. You depress the switch,
let up momentarily, then re-depress the switch to change modes. The method
to accomplish this is above my pay-grade, but I am sure there are people on
here that can explain.
Justin
On Sep 10, 2014, at 14:48, Eric Page <edpav8r@yahoo.com> wrote:
>
> On Sep 10, 2014, at 2:33 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
>> This can be done . . . but at no trivial bill of materials. I.e., parts count
really jumps and FMEA suffers when you place several of the ship's functions
under the influence of one part.
>>
>> [SNIP]
>>
>> The short answer is, you CAN do such a thing. Aside from meeting a technical
challenge for having accomplished it . . . how did it affect system reliability?
>>
>> Bob . . .
>
> Indeed. I'd imagine the simplest and most reliable fix for the original poster
on this thread would be to use the existing single wire as a fish tape to pull
in two new wires.
>
> Eric
>
>
>
>
Message 8
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| Subject: | Re: Two power signals, one wire |
At 06:29 PM 9/10/2014, you wrote:
><jmjones2000@mindspring.com>
>
>There must be a simple way to accomplish this. Surefire flashlights
>have one switch with different "modes" such as dim, bright and
>flash. You depress the switch, let up momentarily, then re-depress
>the switch to change modes. The method to accomplish this is above
>my pay-grade, but I am sure there are people on here that can explain.
Yes, it's a micro-controller programmed with the various
operating modes. A guy I work with at Textron has 'hacked'
one such product and installed his own variants on the
operating features.
Bob . . .
Message 9
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| Subject: | Re: Speaking of battery issues... |
At 03:03 AM 8/27/2014, you wrote:
>Hi Bob-
>
>Were you ever able to glean anything from the
>Battery Tender Jr I sent you some time back?
>
>Tnx-
Yes, it was the second BT I picked out of the box. It
charges at a very low rate and oscillates between
charging and fully charged indications on the front
panel LED.
Your original suspicions were correct . . . eess kaput!
Bob . . .
Message 10
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| Subject: | Re: Electronic Ignition Competitive Comparison |
Lightspeed claims
<http://www.lightspeedengineering.com/Products/IgnitionBasics.htm> > 130
mJ, which should be way off those charts. This would seemingly match the
perceived benefits of CDI as well (high energy due to 0.5*C*V^2. What's
the whole truth here? Is the 100 ohm series resistor messing things up
somehow? I'd like to see the measurement made using a current transducer
instead of a resistance.
-Jeff-
On Wed, Sep 10, 2014 at 3:38 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 06:18 PM 9/9/2014, you wrote:
>
> With much talk about the EFII system by Robert Paisley here lately, I
> thought I would share the results of a test between the EFII system, a
> Slick Magneto, the Pmag 114, and the Lightspeed Plasma II+ systems.
>
> http://www.flyefii.com/ignition/ignition_comparison.htm
>
>
> Bob, I am interested in your thoughts on this test.
>
>
> Thanks for the heads-up on this. It will take some
> time to study the piece . . . but I will get back
> to you . . .
>
>
> Bob . . .
>
> *
>
>
> *
>
>
Message 11
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| Subject: | Re: Electronic Ignition Competitive Comparison |
I am very interested in this thread...... I built and sold an 0360 with dual
p mags and was really impressed with the run in on the test stand. Engine s
eemed to be extremely smooth and powerful. Have had no feed back from the b
uyer, which is probably significant. Now I am building an 85 Cont with O20
0 jugs and crank. Was thinking of going with the p mags again.
M. Haught
Sent from my iPad
> On Sep 10, 2014, at 9:11 PM, "Jeff B." <loboflyer@gmail.com> wrote:
>
> Lightspeed claims > 130 mJ, which should be way off those charts. This wou
ld seemingly match the perceived benefits of CDI as well (high energy due to
0.5*C*V^2. What's the whole truth here? Is the 100 ohm series resistor me
ssing things up somehow? I'd like to see the measurement made using a curre
nt transducer instead of a resistance.
>
> -Jeff-
>
>> On Wed, Sep 10, 2014 at 3:38 PM, Robert L. Nuckolls, III <nuckolls.bob@ae
roelectric.com> wrote:
>> At 06:18 PM 9/9/2014, you wrote:
>>> With much talk about the EFII system by Robert Paisley here lately, I th
ought I would share the results of a test between the EFII system, a Slick M
agneto, the Pmag 114, and the Lightspeed Plasma II+ systems.
>>>
>>> http://www.flyefii.com/ignition/ignition_comparison.htm
>>>
>>>
>>> Bob, I am interested in your thoughts on this test.
>>
>> Thanks for the heads-up on this. It will take some
>> time to study the piece . . . but I will get back
>> to you . . .
>>
>>
>> Bob . . .
>>
>>
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-Li
st
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>>
>
>
>
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