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12-23-2006, 01:00 PM
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#1 | | Palm is a 4-letter Word?
Join Date: Nov 2006 Location: Ohio
Posts: 461
 | Battery power for GPS?
Is it possible to power both the GPS and the Palm (Tuingsten E) from a separate battery pack? My GPS will operate fron 4.5V - 5.5V, so I can use a 4.8V NiCd battery pack, and hopefully, hook it up to a car adapter cable, less the cigarette lighter plug- or just replace the plug with the battery pack.
This would allow one to have a PDA-based handheld GPS. I think you would have a big bundle of wires tho. We will see. 
thx
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12-24-2006, 07:10 AM
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#2 | | Registered User
Join Date: Dec 2004
Posts: 1,853
| Hi, Proporta has a nice battery charger for on-the-go-charging. I use it extensively on my T3...review coming soon! | |
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12-24-2006, 08:01 PM
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#3 | | Palm is a 4-letter Word?
Join Date: Nov 2006 Location: Ohio
Posts: 461
| I was thinking more of powering the Palm and GPS direct from a discrete battery, and saving the Palm's internal battery for regular use or extended use/emergency. I'm sure it would be easy to tap into the car kit's wiring to power the GPS, at a minimum. It seems necessary to do so because either the Palm's battery couldn't powe a GPS for long, or doesn't have a TTL level power source available. I suspect the charge port on the Palm is diode-protected, and if I can find the correct plug, I'll find out for sure. Also, the docs only gives the input voltage range of 4.75 - 5.5V, but doesn't mention the current drain rate; Anybody know?
I've just thunk up this idea, so I'll need to grab paper and define the wiring and other stuff properly. Maybe even a case to hold the Palm, the GPS receiver, and the battery, This holiday season is over-taxing the brain cells as well as my schedule this year, so a break will be more than welcome.
thx
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Last edited by Tomohawk : 12-28-2006 at 05:40 PM.
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11-20-2007, 03:46 PM
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#4 | | Palm is a 4-letter Word?
Join Date: Nov 2006 Location: Ohio
Posts: 461
| Is there a standalone GPS receiver that would plug into a Tungsten E? That would be the best alternative.
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11-20-2007, 09:52 PM
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#5 | | Registered User
Join Date: Feb 2007
Posts: 194
| It's possible to power both a GPS and a Palm from the same cable set. I made one, using a Palm charge/sync cable and the cable for a Garmin, connecting them both to a USB cable, and powered it from a cigarette lighter USB charger. I connected the GPS output to the Palm serial connector, to both connect the devices together and to charge them. Of course, this was with a Palm with a universal connector, not just a mini-USB port. If you have only a USB port, you're SOL for connecting a GPS or anything else, because the Palm isn't a USB host, and USB slaves can't communicate with each other, only with hosts. Kirrio sells (or at least used to sell) a GPS specifically for the T|E, which had USB host circuitry. Try Googling Kirrio GPS and see if there are still any for sale. It wasn't cheap, but it was the only thing that worked. | |
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11-20-2007, 09:59 PM
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#6 | | Palm is a 4-letter Word?
Join Date: Nov 2006 Location: Ohio
Posts: 461
| I have the GPS cabling for the receiver in the car, and it's a big bess. There's no way you could wind all that up and add a big battery, to power things. You'd be better off putting it all in a day-pack.
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12-01-2007, 01:32 PM
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#7 | | Palm is a 4-letter Word?
Join Date: Nov 2006 Location: Ohio
Posts: 461
| Hi sgosnell
Since I have an SD GPS, I was thinking about making up a barry pack for the Palm, like a 4.8V NiCd pack,which should be OK, since the spec'd input voltage is 4.5V - 5.5V. I could even make up a 6V NiCd pack and drop the volts a little with a diode (serial diodes drop ~0.7 Volts each.) The question now would be whether go into the charger jack or the USB port? Which would take the voltage from the battery, and make the better use of the power flow?
thx
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