 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
millner(at)me.com
Guest
|
 Posted: Tue Sep 09, 2014 2:50 pm Post subject: Two power signals, one wire |
 |
|
I remember the fun stump-the-freshman boxes we'd build in school to
control, one, two or three lights on one box with one two or three
switches on another box, with only two wires running between them. (It
was done with isolated power sources AKA batteries and diodes.)
I've got a similar challenge. I've got one #18 wire that runs out to the
tip of the tail for the beacon and aft position light. I'd like to
separate them. I guess I could do a similar trick with a diode and an
isolated power supply (instead of a second battery, I guess I could use
an IC that generates isolated power via a charge pump...). Is there a
more traditional way to separately control two loads at the end of a
single wire?
Paul
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
edpav8r(at)yahoo.com
Guest
|
| Posted: Wed Sep 10, 2014 6:19 am Post subject: 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(at)charter.net> wrote:
| Quote: | The answer is an emphatic NO and YES.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Sep 10, 2014 1:36 pm Post subject: Two power signals, one wire |
|
|
At 09:18 AM 9/10/2014, you wrote:
| Quote: |
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 . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
edpav8r(at)yahoo.com
Guest
|
| Posted: Wed Sep 10, 2014 2:50 pm Post subject: Two power signals, one wire |
|
|
On Sep 10, 2014, at 2:33 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: | 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
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
jmjones2000(at)mindspring
Guest
|
| Posted: Wed Sep 10, 2014 3:30 pm Post subject: 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(at)yahoo.com> wrote:
| Quote: |
On Sep 10, 2014, at 2:33 PM, "Robert L. Nuckolls, III" <nuckolls.bob(at)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
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Sep 10, 2014 4:02 pm Post subject: Two power signals, one wire |
|
|
At 06:29 PM 9/10/2014, you wrote:
| Quote: |
<jmjones2000(at)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 . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
|
| Posted: Thu Sep 11, 2014 4:03 pm Post subject: Re: Two power signals, one wire |
|
|
It turns out Magnecraft actually still sells relays that allow lots of funny-business to be done with one wire and a ground.
http://www.serelays.com/library/archive/104_Section5.pdf
Imagine a single push button in the cockpit that drives a small remote-end motor that has a cam that pushes a bunch of microswitches. The only problem is knowing how long to push the button...enter the stepping relay. One push one step.
Stepping relays were used for telephone dialing. n-pulses on the dial and the stepping relay will step n-times. Imagine how cool it would be to have a rotary telephone dial on your panel! It could handle all your switching needs.
Stepping relays were also used in old pinball machines. The ball hits the bumper, and the stepping relay indexes the lights to new locations.
Enjoy. Send me a picture if you put a telephone dial on your panel. The gold ones might go along with your Jules Verne Nautilus motif interior.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
