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rnjcurtis(at)charter.net
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 Posted: Tue Sep 09, 2014 3:57 pm Post subject: AeroElectric-List: Two power signals, one wire |
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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?
| Quote: | Is it not possible to pull in a second wire? It seems like you are complicating a relatively simple exercise. Perhaps it is an inexcessable place. Tell us more.
Roger
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Wed Sep 10, 2014 5:53 am Post subject: Re: AeroElectric-List: Two power signals, one wire |
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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).
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
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