From: Johnnie T. <joh...@gm...> - 2006-07-18 06:43:54
|
I am looking to run the gumstix and its other hardware from a Polymer Li-Ion Battery, 3.7V 2700mAh. Link to battery: http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=579 The boards I am looking at using are, connex 400xm-bt, GPSstix, cfstix and a tweener. As well an 3.5" LCD and Touch Panel. I have a few questions/problems.. 1. how do I hook the battery up. I am no using a breakout and thats the only I saw with conntects for a batt. 2. Anyone have any ideas on a recharge circut for this ? 3. How do I figure the power drain and runtime ? I have some ideas to my own questions, but like to bounce ideas and see if I am off track. Thanks, John Tilghman |
From: Dave H. <dhy...@gm...> - 2006-07-18 13:23:43
|
Hi John, On 7/17/06, Johnnie Tilghman <joh...@gm...> wrote: > I am looking to run the gumstix and its other hardware from a Polymer Li-Ion > Battery, 3.7V 2700mAh. > > Link to battery: http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=579 > > The boards I am looking at using are, connex 400xm-bt, GPSstix, cfstix and a > tweener. As well an 3.5" LCD and Touch Panel. Be careful with the cfstix. Some CF cards need/want 5v. > 1. how do I hook the battery up. I am no using a breakout and thats the only I > saw with conntects for a batt. Buy a jack at DigiKey and connect the battery up the same way as the WallWart. >From the http://www.gumstix.org/tikiwiki/tiki-index.php?page=POWER_JACK page: CUI Part number PP-012, Digikey part number CP-012-ND. You can also solder some wires onto the back of the connector, like in this photo: http://davehylands.com/linux/gumstix/Case-Fit/Small/HPNX0079.html and add your own connector. (DigiKey charges $6 for orders under $30 or so, so you may want to pick up some other stuff at the same time). > 2. Anyone have any ideas on a recharge circut for this ? Maxim has a few chips just for this: <http://www.maxim-ic.com/solutions/battery_management/parts.mvp/scpk/1227/pl_pk/0> Generally speaking you don't want to try and design a charger for the lithium batteries unless you know what you're doing. > 3. How do I figure the power drain and runtime ? Measure the current consumption in your configuration (using a multimeter), and inteporlate. Beware that Li-Ion can only be drained so far before damaging them, so you typically need to monitor the battery voltage and shut yourself down if the voltage is too low. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Nicholas Sinnott-A. <no...@ma...> - 2006-07-18 13:42:42
|
> > 2. Anyone have any ideas on a recharge circut for this ? http://www.sparkfun.com/commerce/product_info.php?products_id=726 This looks like a really, really nice recharge circuit. I haven't tried it myself, but I have only seen good stuff about it. Just plug in the battery, and the charger charges it correctly when plugged in, and the output connectors allow direct access to the battery for connecting to the gumstix. You could also design a custom board for that chip, which sparkfun also sells, but I reccomend just using the prebuilt one because 1) it is guaranteed to work (pretty much), and 2) Unless you are buying other boards in addition, it will cost more to make your own PCB. hope that helps! nick |
From: Marc N. <gee...@gm...> - 2006-07-18 15:39:20
|
The Sparkfun circuit and the chip that it uses are both good. I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. -marc On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> wrote: > > > > > 2. Anyone have any ideas on a recharge circut for this ? > http://www.sparkfun.com/commerce/product_info.php?products_id=726 > > This looks like a really, really nice recharge circuit. I haven't > tried it myself, but I have only seen good stuff about it. > Just plug in the battery, and the charger charges it correctly when > plugged in, and the output connectors allow direct access to the > battery for connecting to the gumstix. > > You could also design a custom board for that chip, which sparkfun > also sells, but I reccomend just using the prebuilt one because 1) it > is guaranteed to work (pretty much), and 2) Unless you are buying > other boards in addition, it will cost more to make your own PCB. > > hope that helps! > nick > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Jesse W. <jda...@ho...> - 2006-07-19 01:51:31
|
Just out of curiosoty what perifrials are you using and what kind of up time are you getting in your current configuration -Jesse W. >From: "Marc Nicholas" <gee...@gm...> >Reply-To: "General mailing list for gumstix users." ><gum...@li...> >To: "General mailing list for gumstix users." ><gum...@li...> >Subject: Re: [Gumstix-users] Gumstix and Batteries.. >Date: Tue, 18 Jul 2006 11:39:01 -0400 > >The Sparkfun circuit and the chip that it uses are both good. > >I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > >-marc > >On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> wrote: >> >> > >> > 2. Anyone have any ideas on a recharge circut for this ? >>http://www.sparkfun.com/commerce/product_info.php?products_id=726 >> >>This looks like a really, really nice recharge circuit. I haven't >>tried it myself, but I have only seen good stuff about it. >>Just plug in the battery, and the charger charges it correctly when >>plugged in, and the output connectors allow direct access to the >>battery for connecting to the gumstix. >> >>You could also design a custom board for that chip, which sparkfun >>also sells, but I reccomend just using the prebuilt one because 1) it >>is guaranteed to work (pretty much), and 2) Unless you are buying >>other boards in addition, it will cost more to make your own PCB. >> >>hope that helps! >>nick >> >>------------------------------------------------------------------------- >>Take Surveys. Earn Cash. Influence the Future of IT >>Join SourceForge.net's Techsay panel and you'll get the chance to share >>your >>opinions on IT & business topics through brief surveys -- and earn cash >>http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >>_______________________________________________ >>gumstix-users mailing list >>gum...@li... >>https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >------------------------------------------------------------------------- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys -- and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >_______________________________________________ >gumstix-users mailing list >gum...@li... >https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: Alec W. <ale...@da...> - 2006-07-19 16:06:30
|
Hi Marc, > The Sparkfun circuit and the chip that it uses are both good. > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. Is anything else required apart from the charger and the battery? Is it literally a case of running wires between the battery and the charger, and the charger and the gumstix? Would this battery be as appropriate as the 860mAh unit from Sparkfun? http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=473 many thanks, alec -- Alec Waters CCNP Dataline Software Ltd Clarence House, 30-31 North Street, Brighton, BN1 1EB, UK Tel: +44 (0)1273 324939 Fax: +44 (0)1273 205576 www: http://www.dataline.co.uk IPv6: http://www.ipv6.dataline.co.uk |
From: Chris D. <cg...@co...> - 2006-07-19 16:51:38
|
On 7/19/06, Alec Waters <ale...@da...> wrote: > Is anything else required apart from the charger and the battery? Is it > literally a case of running wires between the battery and the charger, > and the charger and the gumstix? It is. The only thing you forgot to specify was an external DC source -- can be USB or can be +5vdc from another source. > Would this battery be as appropriate as the 860mAh unit from Sparkfun? > > http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=473 It's one cell, so yes, it would be. Note that the charger chip restricts charge current to 100mA in the case of USB and to (IIRC) 300mA in the case of external DC power, so this battery will take quite a long time to charge... best case a full charge will take almost a day (~21-22 hours). If charging from USB, multiply that figure by 3. -chris |
From: Marc N. <gee...@gm...> - 2006-07-19 17:02:53
|
Alan, Yes, that battery would be fine. As someone else pointed out, it'll take a LONG time to charge with a charger based on the Maxim IC. The Maxim IC was designed for things like cellphones and PDAs....that battery could freakin' power the Mars Rover! ;-) I notice those guys sell a "protection circuit" for about a buck...for that money, it's worth getting. Theoretically, accidentally shorting, overdischarging or overcharging a LiPoly can make it explode...although I've yet to demonstrate this myself. -marc On 7/19/06, Alec Waters <ale...@da...> wrote: > > Hi Marc, > > > The Sparkfun circuit and the chip that it uses are both good. > > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > > Is anything else required apart from the charger and the battery? Is it > literally a case of running wires between the battery and the charger, > and the charger and the gumstix? > > Would this battery be as appropriate as the 860mAh unit from Sparkfun? > > http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=473 > > many thanks, > alec > -- > Alec Waters CCNP > Dataline Software Ltd > Clarence House, 30-31 North Street, Brighton, BN1 1EB, UK > > Tel: +44 (0)1273 324939 > Fax: +44 (0)1273 205576 > www: http://www.dataline.co.uk > IPv6: http://www.ipv6.dataline.co.uk > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Chris D. <cg...@co...> - 2006-07-19 17:07:21
|
On 7/19/06, Marc Nicholas <gee...@gm...> wrote: > I notice those guys sell a "protection circuit" for about a buck...for that > money, it's worth getting. Theoretically, accidentally shorting, > overdischarging or overcharging a LiPoly can make it explode...although I've > yet to demonstrate this myself. I've gotten close personally -- myself and a few others once undervolted two LiPoly packs; they started to inflate (they reached about 2x their normal volume) and get very warm. Fortunately there are campus services for disposing of hazardous materials... Some of my acquiantances also once started a small fire due to overcharging LiPolys with faulty protection circuits. There's a lot of energy in LiPoly packs. Please do have respect for them :) best, -chris |
From: Alec W. <ale...@da...> - 2006-07-19 20:10:26
|
Thanks, Chris, Marc. alec -- Alec Waters CCNP Dataline Software Ltd Clarence House, 30-31 North Street, Brighton, BN1 1EB, UK Tel: +44 (0)1273 324939 Fax: +44 (0)1273 205576 www: http://www.dataline.co.uk IPv6: http://www.ipv6.dataline.co.uk |
From: Alec W. <ale...@da...> - 2006-07-19 20:46:51
|
Hi Marc, > Yes, that battery would be fine. As someone else pointed out, it'll > take a LONG time to charge with a charger based on the Maxim IC. The > Maxim IC was designed for things like cellphones and PDAs....that > battery could freakin' power the Mars Rover! ;-) My (ill-conceived and almost certainly fundamentally-flawed) plan is to have a battery-backed solar-powered gumstix, with the battery covering the times when you can't see the big feiry thing in the sky. So I need to be able to power the stix from the solar panel, whilst having enough left over to put enough juice into the battery to last the night.... alec -- Alec Waters CCNP Dataline Software Ltd Clarence House, 30-31 North Street, Brighton, BN1 1EB, UK Tel: +44 (0)1273 324939 Fax: +44 (0)1273 205576 www: http://www.dataline.co.uk IPv6: http://www.ipv6.dataline.co.uk |
From: Marc N. <gee...@gm...> - 2006-07-19 20:52:37
|
On 7/19/06, Alec Waters <ale...@da...> wrote: > > Hi Marc, > > > Yes, that battery would be fine. As someone else pointed out, it'll > > take a LONG time to charge with a charger based on the Maxim IC. The > > Maxim IC was designed for things like cellphones and PDAs....that > > battery could freakin' power the Mars Rover! ;-) > > My (ill-conceived and almost certainly fundamentally-flawed) plan is to > have a battery-backed solar-powered gumstix, with the battery covering > the times when you can't see the big feiry thing in the sky. > > So I need to be able to power the stix from the solar panel, whilst > having enough left over to put enough juice into the battery to last the > night.... I think what you really mean is that you want to power the battery charger from the solar panel and power the Gumstix from the battery ;-) -marc |
From: Ed C. <eca...@gm...> - 2006-07-18 16:09:34
|
What kind of uptime do you see from 860mAh? Will this charger properly charge 2 of these batteries in series (I have a robostix I'd like to run and the 3.7V is a touch low). On 7/18/06, Marc Nicholas <gee...@gm...> wrote: > > The Sparkfun circuit and the chip that it uses are both good. > > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > > -marc > > > On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> wrote: > > > > > > > > 2. Anyone have any ideas on a recharge circut for this ? > > http://www.sparkfun.com/commerce/product_info.php?products_id=726 > > > > This looks like a really, really nice recharge circuit. I haven't > > tried it myself, but I have only seen good stuff about it. > > Just plug in the battery, and the charger charges it correctly when > > plugged in, and the output connectors allow direct access to the > > battery for connecting to the gumstix. > > > > You could also design a custom board for that chip, which sparkfun > > also sells, but I reccomend just using the prebuilt one because 1) it > > is guaranteed to work (pretty much), and 2) Unless you are buying > > other boards in addition, it will cost more to make your own PCB. > > > > hope that helps! > > nick > > > > > > ------------------------------------------------------------------------- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to share > > your > > opinions on IT & business topics through brief surveys -- and earn cash > > > > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > |
From: Marc N. <gee...@gm...> - 2006-07-18 16:11:19
|
I haven't done a runtime test yet....I will if you're interested. No, this is a single cell charging IC...don't mess with series! You also need to be careful using LiPoly's in series. -marc On 7/18/06, Ed Camacho <eca...@gm...> wrote: > > > What kind of uptime do you see from 860mAh? Will this charger properly > charge 2 of these batteries in series (I have a robostix I'd like to run and > the 3.7V is a touch low). > > > > > On 7/18/06, Marc Nicholas <gee...@gm...> wrote: > > > > The Sparkfun circuit and the chip that it uses are both good. > > > > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > > > > -marc > > > > > > On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> wrote: > > > > > > > > > > > 2. Anyone have any ideas on a recharge circut for this ? > > > http://www.sparkfun.com/commerce/product_info.php?products_id=726 > > > > > > This looks like a really, really nice recharge circuit. I haven't > > > tried it myself, but I have only seen good stuff about it. > > > Just plug in the battery, and the charger charges it correctly when > > > plugged in, and the output connectors allow direct access to the > > > battery for connecting to the gumstix. > > > > > > You could also design a custom board for that chip, which sparkfun > > > also sells, but I reccomend just using the prebuilt one because 1) it > > > is guaranteed to work (pretty much), and 2) Unless you are buying > > > other boards in addition, it will cost more to make your own PCB. > > > > > > hope that helps! > > > nick > > > > > > > > > ------------------------------------------------------------------------- > > > Take Surveys. Earn Cash. Influence the Future of IT > > > Join SourceForge.net's Techsay panel and you'll get the chance to > > > share your > > > opinions on IT & business topics through brief surveys -- and earn > > > cash > > > > > > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > > _______________________________________________ > > > gumstix-users mailing list > > > gum...@li... > > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > > > > > > ------------------------------------------------------------------------- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to share > > your > > opinions on IT & business topics through brief surveys -- and earn cash > > > > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > |
From: Chris D. <cg...@co...> - 2006-07-18 17:54:56
|
On 7/18/06, Ed Camacho <eca...@gm...> wrote: > What kind of uptime do you see from 860mAh? Will this charger properly > charge 2 of these batteries in series (I have a robostix I'd like to run and > the 3.7V is a touch low). You could probably easily design a circuit around (or even find sample schematics for in a datasheet) a DC-DC boost converter chip to step up from ~3.7v to 5v regulated. It's not that hard, and at low current draws, it's actually reasonably efficient (~85%). You might want a bigger cell, but then again, Sparkfun has those too... -chris |
From: Ben F. <be...@fi...> - 2006-07-18 17:01:38
|
The Gumstix draws at most 250MAh (is that excluding expansions? not sure), so you could expect to get at least 3 hours off it assuming the voltage doesn't drop too much. Ben On 18 Jul 2006, at 17:05, Ed Camacho wrote: > > What kind of uptime do you see from 860mAh? Will this charger > properly charge 2 of these batteries in series (I have a robostix > I'd like to run and the 3.7V is a touch low). > > > > On 7/18/06, Marc Nicholas <gee...@gm...> wrote: > The Sparkfun circuit and the chip that it uses are both good. > > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > > -marc > > > On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> > wrote: > > > 2. Anyone have any ideas on a recharge circut for this ? > http://www.sparkfun.com/commerce/product_info.php?products_id=726 > > This looks like a really, really nice recharge circuit. I haven't > tried it myself, but I have only seen good stuff about it. > Just plug in the battery, and the charger charges it correctly when > plugged in, and the output connectors allow direct access to the > battery for connecting to the gumstix. > > You could also design a custom board for that chip, which sparkfun > also sells, but I reccomend just using the prebuilt one because 1) it > is guaranteed to work (pretty much), and 2) Unless you are buying > other boards in addition, it will cost more to make your own PCB. > > hope that helps! > nick > > ---------------------------------------------------------------------- > --- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to > share your > opinions on IT & business topics through brief surveys -- and earn > cash > http://www.techsay.com/default.php? > page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > ---------------------------------------------------------------------- > --- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to > share your > opinions on IT & business topics through brief surveys -- and earn > cash > http://www.techsay.com/default.php? > page=join.php&p=sourceforge&CID=DEVDEV > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > ---------------------------------------------------------------------- > --- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to > share your > opinions on IT & business topics through brief surveys -- and earn > cash > http://www.techsay.com/default.php? > page=join.php&p=sourceforge&CID=DEVDEV________________________________ > _______________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users -- Ben Firshman be...@fi... http://www.phatmonkey.org.uk/ |
From: Marc N. <gee...@gm...> - 2006-07-18 17:15:35
|
I think you'll find voltage drops too much before you are out of battery juice... -marc On 7/18/06, Ben Firshman <be...@fi...> wrote: > > The Gumstix draws at most 250MAh (is that excluding expansions? not > sure), so you could expect to get at least 3 hours off it assuming > the voltage doesn't drop too much. > > Ben > > On 18 Jul 2006, at 17:05, Ed Camacho wrote: > > > > > What kind of uptime do you see from 860mAh? Will this charger > > properly charge 2 of these batteries in series (I have a robostix > > I'd like to run and the 3.7V is a touch low). > > > > > > > > On 7/18/06, Marc Nicholas <gee...@gm...> wrote: > > The Sparkfun circuit and the chip that it uses are both good. > > > > I'm using an 860mAh LiPoly from Sparkfun with my Gumstix right now. > > > > -marc > > > > > > On 7/18/06, Nicholas Sinnott-Armstrong <no...@ma...> > > wrote: > > > > 2. Anyone have any ideas on a recharge circut for this ? > > http://www.sparkfun.com/commerce/product_info.php?products_id=726 > > > > This looks like a really, really nice recharge circuit. I haven't > > tried it myself, but I have only seen good stuff about it. > > Just plug in the battery, and the charger charges it correctly when > > plugged in, and the output connectors allow direct access to the > > battery for connecting to the gumstix. > > > > You could also design a custom board for that chip, which sparkfun > > also sells, but I reccomend just using the prebuilt one because 1) it > > is guaranteed to work (pretty much), and 2) Unless you are buying > > other boards in addition, it will cost more to make your own PCB. > > > > hope that helps! > > nick > > > > ---------------------------------------------------------------------- > > --- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to > > share your > > opinions on IT & business topics through brief surveys -- and earn > > cash > > http://www.techsay.com/default.php? > > page=join.php&p=sourceforge&CID=DEVDEV > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > ---------------------------------------------------------------------- > > --- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to > > share your > > opinions on IT & business topics through brief surveys -- and earn > > cash > > http://www.techsay.com/default.php? > > page=join.php&p=sourceforge&CID=DEVDEV > > > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > > > ---------------------------------------------------------------------- > > --- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to > > share your > > opinions on IT & business topics through brief surveys -- and earn > > cash > > http://www.techsay.com/default.php? > > page=join.php&p=sourceforge&CID=DEVDEV________________________________ > > _______________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- > Ben Firshman > be...@fi... http://www.phatmonkey.org.uk/ > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: ken s. <ken...@gm...> - 2006-07-18 18:01:30
|
Hi John, On 7/17/06, Johnnie Tilghman <joh...@gm...> wrote: > I am looking to run the gumstix and its other hardware from a Polymer Li-Ion > Battery, 3.7V 2700mAh. > > Link to battery: http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=579 > 2. Anyone have any ideas on a recharge circut for this ? >From the battery link: Cautions * Use special caution when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled. * Make sure user has enough knowledge on Li-Ion rechargeable batteries in charging, discharging and assembly before use. * We are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteries > 3. How do I figure the power drain and runtime ? You'll need to measure the current for your board combination with application code running. Note that the mAh spec on the battery is usually at a fairly low current level (i.e. best case). Regards, Ken |
From: Brian G. <br...@in...> - 2006-07-18 18:17:58
|
I have one of these that I am currently using to power the gumstix/robostix combo (and a few motors & such in parallel). They weight almost nothing (70g) and when the motor use is minimal I can get 6-7 hours of life. Unfortunately I can only testify to that success, and I can't help you with the charging circuit; I use their recommended bench charger. Brian Gregory |
From: Alec W. <ale...@da...> - 2006-07-19 20:54:48
|
Marc Nicholas wrote: > I think what you really mean is that you want to power the battery > charger from the solar panel and power the Gumstix from the battery ;-) Well, I did say it was ill-conceived and fundamentally flawed :) alec -- Alec Waters CCNP Dataline Software Ltd Clarence House, 30-31 North Street, Brighton, BN1 1EB, UK Tel: +44 (0)1273 324939 Fax: +44 (0)1273 205576 www: http://www.dataline.co.uk IPv6: http://www.ipv6.dataline.co.uk |
From: Chris D. <cg...@co...> - 2006-07-20 02:37:22
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On 7/19/06, Alec Waters <ale...@da...> wrote: > Marc Nicholas wrote: > > I think what you really mean is that you want to power the battery > > charger from the solar panel and power the Gumstix from the battery ;-) > > Well, I did say it was ill-conceived and fundamentally flawed :) When anyone says that a device is "powered by a solar panel" this is pretty much always what they mean. You just have to make sure that your average power input is, y'know, more than your average power use. -chris |
From: Kirk M. <km...@ec...> - 2006-07-22 15:55:45
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noticed the UK domain... I just bought a couple of > 1W panels from Maplin for =A310 each :-) big=20 but window-sill friendly ... will try them on a gum when I get back from Norway Glacsweb trip. Also=20 putting easyradio on them for fun :-) cheers Kirk Alec Waters wrote: > Hi Marc, > > =20 >> Yes, that battery would be fine. As someone else pointed out, it'll=20 >> take a LONG time to charge with a charger based on the Maxim IC. The=20 >> Maxim IC was designed for things like cellphones and PDAs....that=20 >> battery could freakin' power the Mars Rover! ;-) >> =20 > > My (ill-conceived and almost certainly fundamentally-flawed) plan is to= =20 > have a battery-backed solar-powered gumstix, with the battery covering=20 > the times when you can't see the big feiry thing in the sky. > > So I need to be able to power the stix from the solar panel, whilst=20 > having enough left over to put enough juice into the battery to last th= e=20 > night.... > > alec > =20 --=20 Electronics and Computer Science University of Southampton, UK +44 (0)2380 594491 http://www.ecs.soton.ac.uk/~km |
From: Karl v. M. <ver...@gm...> - 2006-07-23 00:31:32
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i've orderded myself one of these to have a play with - http://www.environmentshop.com.au/ProductDetails.asp?PID=3D2939 unfortunately being winter over here dont know how it'll go...be an interesting test though. On 7/23/06, Kirk Martinez <km...@ec...> wrote: > > noticed the UK domain... > I just bought a couple of > 1W panels from Maplin for =A310 each :-) big > but window-sill friendly ... > will try them on a gum when I get back from Norway Glacsweb trip. Also > putting easyradio on them for fun :-) > cheers > Kirk > > Alec Waters wrote: > > Hi Marc, > > > > > >> Yes, that battery would be fine. As someone else pointed out, it'll > >> take a LONG time to charge with a charger based on the Maxim IC. The > >> Maxim IC was designed for things like cellphones and PDAs....that > >> battery could freakin' power the Mars Rover! ;-) > >> > > > > My (ill-conceived and almost certainly fundamentally-flawed) plan is to > > have a battery-backed solar-powered gumstix, with the battery covering > > the times when you can't see the big feiry thing in the sky. > > > > So I need to be able to power the stix from the solar panel, whilst > > having enough left over to put enough juice into the battery to last th= e > > night.... > > > > alec > > > > -- > Electronics and Computer Science > University of Southampton, UK > +44 (0)2380 594491 > http://www.ecs.soton.ac.uk/~km > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=3Djoin.php&p=3Dsourceforge&CID=3D= DEVDEV > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |