gumstix

Hi Jay,

> I've been unable to locate power consumption specs for expansion boards,
> specifically robostix and netwifimicro-SD. I did find the specs for the
> motherboards.
>
> Does anyone know where these can be found?

For the robostix, the answer is "it depends".

It depends on what code is running, and what devices you have
attached. The best way of determining things is to connect up the
stuff you want and measure it using a multi-meter.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

I know that "it depends". I was looking for some "order of magnitude" type
of info.

I put 250mA in the spreadsheet as a placeholder for now. Same for the
netwifimicro-SD.

The big current draws are going to be the drive motors, with a locked-shaft
current of 5A.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 9:43 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

> I've been unable to locate power consumption specs for expansion boards,
> specifically robostix and netwifimicro-SD. I did find the specs for the
> motherboards.
>
> Does anyone know where these can be found?

For the robostix, the answer is "it depends".

It depends on what code is running, and what devices you have
attached. The best way of determining things is to connect up the
stuff you want and measure it using a multi-meter.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Thanks for those numbers.

I'm already tracking sensor draws separately, so the 100mA sounds better
than 250mA.

Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
possibility of shutting off the wired connection to save power since I won't
be using it.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 10:27 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a
locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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HI Jay,

On Jan 31, 2008 10:30 AM, Jay Phillips <jay.phillips@...> wrote:
> Thanks for those numbers.
>
> I'm already tracking sensor draws separately, so the 100mA sounds better
> than 250mA.
>
> Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
> possibility of shutting off the wired connection to save power since I won't
> be using it.

Yeah - this is why you can't power a gumstix w/ wifi from a robostix,
which only has a 500mA regulator providing power to the gumstix.

I wouldn't be surprised if the instantaneous current draws from the
wifi module are in the 1+A range. 500mA for just the wifi module

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

WiFi even in idle mode (i.e. No Tx /RX) takes about 1W. When using 
Infrastructure mode (i.e. With an Acess Point) there is a possibility 
to use the WiFi Power Save Mode (PSM) which can reduce the power 
consumption dramatically although currently the driver is a bit flaky. 
>From my measurements the power consumption is PSM drops to around 
100-150mW. 

Once you are associated to a WiFi Access Point if you do a  :
 
"iwconfig mwlan0 power on" <-- Sets the PSM 

.or. 

"iwconfig mwlan0 power off" --> Sets the normal awake mode for WiFi. 

(Note : change to "wlan0" instead of "mwlan0" for OE builds) 

One way to tell if the switch worked is that the WiFi yellow LED 
starts to blink at a really fast rate when the PSM is successful. 

Although I repeat again, the WiFi driver still needs work. I have 
documented the WiFi bugs using bugtracker and Steve said he will 
look at them when he does get a chance! 

Hope this helps. 

cheers
Yuvraj


-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Jay
Phillips
Sent: Thursday, January 31, 2008 10:31 AM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Thanks for those numbers.

I'm already tracking sensor draws separately, so the 100mA sounds better
than 250mA.

Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
possibility of shutting off the wired connection to save power since I won't
be using it.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 10:27 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a
locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Yuvraj

Yeah it gets surprisingly hot without powersave. If it ever supports
AP mode then it might be good to put a heatsink on it :)

> Although I repeat again, the WiFi driver still needs work. I have
> documented the WiFi bugs using bugtracker and Steve said he will
> look at them when he does get a chance!

do you have a url for the ticket?

-- 
Brad

Guys,
=20
I have moved up to the current trunk (1584 I believe)
and I am wondering just what I should expect from the gumstix.
=20
The Wifi now comes up and mwlan0 shows up in ifconfig.
(1559 it did not)
=20
However... if I ifdown mwlan0 (to update the settings -- wep junk)
and then ifup mwlan0 it seems to reset the hard ethernet connection...
actually my ssh session toasts... its not terrible... but its REALLY annoyi=
ng.
=20
Is this to be expected?
=20
=20
=20
Now if I add the robostix to the stack... xm4/netwifi-sd/robostix...
It boots... the lan jack lights up... activity light comes on...
and just when it should be starting up the wifi... the lan jack goes
out and no blue blinks on the netwifisd board.... then the lan jack lights
up again and goes through the same cycle... like its trying to start the=20
hard ethernet... then the wireless... over and over...  almost like the wif=
i init
chews enough power to reset the whole stack... (but that's just
a wild guess)
=20
Take the robostix off... blue blinky on start up and no cycling.
put it back on... network jack cycles... =20
=20
I thought it was the way I had assembled the stack... but it
does the same thing screwed together and not screwed together.
=20
Anybody got any ideas??
=20
Scott
=20
=20
=20
=20
=20
=20
=20
=20
=20
 =

Hi Scott,

>  Now if I add the robostix to the stack... xm4/netwifi-sd/robostix...
>  It boots... the lan jack lights up... activity light comes on...
>  and just when it should be starting up the wifi... the lan jack goes
>  out and no blue blinks on the netwifisd board.... then the lan jack lights
>  up again and goes through the same cycle... like its trying to start the
>  hard ethernet... then the wireless... over and over...  almost like the
> wifi init
>  chews enough power to reset the whole stack... (but that's just
>  a wild guess)

You need to either:

1 - Mod the robostix (to connect V_BATT to V_ROBOBATT) as described here
<http://pubs.gumstix.com/documents/robostix_power.pdf>

2 - power both the robostix and the netwifimicrosd board.

The problem is that the robostix has a 500mA regulator for providing
power to the gumstix and the wifi module draws more than that, which
causes the robostix regulator to go into thermal shutdown, which
resets the processor, and the cycle repeats.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Hi Brad, 

So there are various bugs/issues with WiFi. Some of them seem to be related
to the Kernel 
"scheduling while atomic bug" when using wireless utils (iwconfig) to set
the WiFi parameters. 

The tickets can be found at :
1. Marvell WiFi (WiFiStix) "scheduling while atomic" Kernel BUG
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871730&group_
id=98784

2. Marvell WiFi (WiFiStix) cannot associate to a specific AP
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871732&group_
id=98784

3. Marvell WiFi cannot perform link-layer (layer 2) handoff
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1873344&group_
id=98784

Do you have experience working with WiFi / Wireless Drivers? 
If you have any thought on how to fix these bugs/issues, it would be
awesome. :-) 

Once these issues are fixed, there might be further ways to reduce the
WiFiStix power 
consumption even further that I'd like to try. 

cheers
Yuvraj


-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Brad
Midgley
Sent: Thursday, January 31, 2008 12:45 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Yuvraj

Yeah it gets surprisingly hot without powersave. If it ever supports
AP mode then it might be good to put a heatsink on it :)

> Although I repeat again, the WiFi driver still needs work. I have
> documented the WiFi bugs using bugtracker and Steve said he will
> look at them when he does get a chance!

do you have a url for the ticket?

-- 
Brad

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Yuvraj

Does one of these bugs cover the fact that /etc/network/interfaces has
to be written in a funky way, puting all the params together on one
pre-up line?

I won't jump into the drivers myself in the foreseeable future... :(

Brad

On Jan 31, 2008 2:16 PM, Yuvraj Agarwal <yuvraj@...> wrote:
> Hi Brad,
>
> So there are various bugs/issues with WiFi. Some of them seem to be related
> to the Kernel
> "scheduling while atomic bug" when using wireless utils (iwconfig) to set
> the WiFi parameters.
>
> The tickets can be found at :
> 1. Marvell WiFi (WiFiStix) "scheduling while atomic" Kernel BUG
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871730&group_
> id=98784
>
> 2. Marvell WiFi (WiFiStix) cannot associate to a specific AP
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871732&group_
> id=98784
>
> 3. Marvell WiFi cannot perform link-layer (layer 2) handoff
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1873344&group_
> id=98784
>
> Do you have experience working with WiFi / Wireless Drivers?
> If you have any thought on how to fix these bugs/issues, it would be
> awesome. :-)
>
> Once these issues are fixed, there might be further ways to reduce the
> WiFiStix power
> consumption even further that I'd like to try.
>
> cheers
> Yuvraj
>
>
> -----Original Message-----
> From: gumstix-users-bounces@...
> [mailto:gumstix-users-bounces@...] On Behalf Of Brad
> Midgley
> Sent: Thursday, January 31, 2008 12:45 PM
> To: General mailing list for gumstix users.
> Subject: Re: [Gumstix-users] Expansion board power consumption
>
>
> Yuvraj
>
> Yeah it gets surprisingly hot without powersave. If it ever supports
> AP mode then it might be good to put a heatsink on it :)
>
> > Although I repeat again, the WiFi driver still needs work. I have
> > documented the WiFi bugs using bugtracker and Steve said he will
> > look at them when he does get a chance!
>
> do you have a url for the ticket?
>
> --
> Brad
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> gumstix-users mailing list
> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>
>
> -------------------------------------------------------------------------
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> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>



-- 
Brad

So basically...
=20
As purchased out of the box... the robostix wifi pack does'nt work.
*grumble*
=20
=20
Did it not dawn on anyone it might be a good idea to=20
put a Y on the wall wart cable and up the power output
accordingly?
=20
Or maybe note during purchase, that if you want to run this=20
board stack on the bench, (without making modifications) you=20
should have an extra wall wart?
=20
=20
 > Hi Scott,> > > Now if I add the robostix to the stack... xm4/netwifi-sd/=
robostix...> > It boots... the lan jack lights up... activity light comes o=
n...> > and just when it should be starting up the wifi... the lan jack goe=
s> > out and no blue blinks on the netwifisd board.... then the lan jack li=
ghts> > up again and goes through the same cycle... like its trying to star=
t the> > hard ethernet... then the wireless... over and over... almost like=
 the> > wifi init> > chews enough power to reset the whole stack... (but th=
at's just> > a wild guess)> > You need to either:> > 1 - Mod the robostix (=
to connect V_BATT to V_ROBOBATT) as described here> <http://pubs.gumstix.co=
m/documents/robostix_power.pdf>> > 2 - power both the robostix and the netw=
ifimicrosd board.> > The problem is that the robostix has a 500mA regulator=
 for providing> power to the gumstix and the wifi module draws more than th=
at, which> causes the robostix regulator to go into thermal shutdown, which=
> resets the processor, and the cycle repeats.> > -- > Dave Hylands> Vancou=
ver, BC, Canada> http://www.DaveHylands.com/> > ---------------------------=
----------------------------------------------> This SF.net email is sponso=
red by: Microsoft> Defy all challenges. Microsoft(R) Visual Studio 2008.> h=
ttp://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/> ___________________=
____________________________> gumstix-users mailing list> gumstix-users@...=
ts.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/gumstix-us=
ers=

No - it doesn't. I always do it that way anyways, so I haven't noticed any 
errors. I have noticed the fact that if that pre-up is not done correctly 
it sometimes causes issues later when trying to associate to another WiFi 
AP. I am not even sure why the "pre-up" stuff is needed... 

Please file a bug documenting the behavior you are seeing so that it can 
be looked into. 

Steve is our last hope of fixing these bugs when he gets a chance ! :-) 

--Yuvraj 


-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Brad
Midgley
Sent: Thursday, January 31, 2008 1:29 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Yuvraj

Does one of these bugs cover the fact that /etc/network/interfaces has
to be written in a funky way, puting all the params together on one
pre-up line?

I won't jump into the drivers myself in the foreseeable future... :(

Brad

On Jan 31, 2008 2:16 PM, Yuvraj Agarwal <yuvraj@...> wrote:
> Hi Brad,
>
> So there are various bugs/issues with WiFi. Some of them seem to be
related
> to the Kernel
> "scheduling while atomic bug" when using wireless utils (iwconfig) to set
> the WiFi parameters.
>
> The tickets can be found at :
> 1. Marvell WiFi (WiFiStix) "scheduling while atomic" Kernel BUG
>
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871730&group_
> id=98784
>
> 2. Marvell WiFi (WiFiStix) cannot associate to a specific AP
>
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871732&group_
> id=98784
>
> 3. Marvell WiFi cannot perform link-layer (layer 2) handoff
>
https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1873344&group_
> id=98784
>
> Do you have experience working with WiFi / Wireless Drivers?
> If you have any thought on how to fix these bugs/issues, it would be
> awesome. :-)
>
> Once these issues are fixed, there might be further ways to reduce the
> WiFiStix power
> consumption even further that I'd like to try.
>
> cheers
> Yuvraj
>
>
> -----Original Message-----
> From: gumstix-users-bounces@...
> [mailto:gumstix-users-bounces@...] On Behalf Of Brad
> Midgley
> Sent: Thursday, January 31, 2008 12:45 PM
> To: General mailing list for gumstix users.
> Subject: Re: [Gumstix-users] Expansion board power consumption
>
>
> Yuvraj
>
> Yeah it gets surprisingly hot without powersave. If it ever supports
> AP mode then it might be good to put a heatsink on it :)
>
> > Although I repeat again, the WiFi driver still needs work. I have
> > documented the WiFi bugs using bugtracker and Steve said he will
> > look at them when he does get a chance!
>
> do you have a url for the ticket?
>
> --
> Brad
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> gumstix-users mailing list
> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
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> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
>



-- 
Brad

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> Steve is our last hope of fixing these bugs when he gets a chance ! :-)

Hey, it's open source!  Anyone with the inclination is more than
welcome to take a crack at fixing it :-)

Steve

On Jan 31, 2008 4:01 PM, Yuvraj Agarwal <yuvraj@...> wrote:
> No - it doesn't. I always do it that way anyways, so I haven't noticed any
> errors. I have noticed the fact that if that pre-up is not done correctly
> it sometimes causes issues later when trying to associate to another WiFi
> AP. I am not even sure why the "pre-up" stuff is needed...
>
> Please file a bug documenting the behavior you are seeing so that it can
> be looked into.
>
> Steve is our last hope of fixing these bugs when he gets a chance ! :-)
>
> --Yuvraj
>
>
> -----Original Message-----
> From: gumstix-users-bounces@...
> [mailto:gumstix-users-bounces@...] On Behalf Of Brad
> Midgley
>
> Sent: Thursday, January 31, 2008 1:29 PM
> To: General mailing list for gumstix users.
> Subject: Re: [Gumstix-users] Expansion board power consumption
>
> Yuvraj
>
> Does one of these bugs cover the fact that /etc/network/interfaces has
> to be written in a funky way, puting all the params together on one
> pre-up line?
>
> I won't jump into the drivers myself in the foreseeable future... :(
>
> Brad
>
> On Jan 31, 2008 2:16 PM, Yuvraj Agarwal <yuvraj@...> wrote:
> > Hi Brad,
> >
> > So there are various bugs/issues with WiFi. Some of them seem to be
> related
> > to the Kernel
> > "scheduling while atomic bug" when using wireless utils (iwconfig) to set
> > the WiFi parameters.
> >
> > The tickets can be found at :
> > 1. Marvell WiFi (WiFiStix) "scheduling while atomic" Kernel BUG
> >
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871730&group_
> > id=98784
> >
> > 2. Marvell WiFi (WiFiStix) cannot associate to a specific AP
> >
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1871732&group_
> > id=98784
> >
> > 3. Marvell WiFi cannot perform link-layer (layer 2) handoff
> >
> https://sourceforge.net/tracker/?func=detail&atid=1013768&aid=1873344&group_
> > id=98784
> >
> > Do you have experience working with WiFi / Wireless Drivers?
> > If you have any thought on how to fix these bugs/issues, it would be
> > awesome. :-)
> >
> > Once these issues are fixed, there might be further ways to reduce the
> > WiFiStix power
> > consumption even further that I'd like to try.
> >
> > cheers
> > Yuvraj
> >
> >
> > -----Original Message-----
> > From: gumstix-users-bounces@...
> > [mailto:gumstix-users-bounces@...] On Behalf Of Brad
> > Midgley
> > Sent: Thursday, January 31, 2008 12:45 PM
> > To: General mailing list for gumstix users.
> > Subject: Re: [Gumstix-users] Expansion board power consumption
> >
> >
> > Yuvraj
> >
> > Yeah it gets surprisingly hot without powersave. If it ever supports
> > AP mode then it might be good to put a heatsink on it :)
> >
> > > Although I repeat again, the WiFi driver still needs work. I have
> > > documented the WiFi bugs using bugtracker and Steve said he will
> > > look at them when he does get a chance!
> >
> > do you have a url for the ticket?
> >
> > --
> > Brad
> >
> >
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I have a Netstix 200xm-cf with a console-st board added temporarily.
Am using an Enfora GSM modem CF card and having reliability problems
Presumably this might be power ??
So can I plug TWO power supplies in - one to the net-cf board and one to the
console-st board without frying anything ???
Thanks


Dave Hylands wrote:
> 
> HI Jay,
> 
> On Jan 31, 2008 10:30 AM, Jay Phillips <jay.phillips@...> wrote:
>> Thanks for those numbers.
>>
>> I'm already tracking sensor draws separately, so the 100mA sounds better
>> than 250mA.
>>
>> Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
>> possibility of shutting off the wired connection to save power since I
>> won't
>> be using it.
> 
> Yeah - this is why you can't power a gumstix w/ wifi from a robostix,
> which only has a 500mA regulator providing power to the gumstix.
> 
> I wouldn't be surprised if the instantaneous current draws from the
> wifi module are in the 1+A range. 500mA for just the wifi module
> 
> -- 
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> 

-- 
View this message in context: http://www.nabble.com/Expansion-board-power-consumption-tp15208690p15218412.html
Sent from the Gumstix mailing list archive at Nabble.com.

Hi Wayne,

> I have a Netstix 200xm-cf with a console-st board added temporarily.
> Am using an Enfora GSM modem CF card and having reliability problems
> Presumably this might be power ??
> So can I plug TWO power supplies in - one to the net-cf board and one to the
> console-st board without frying anything ???

The power plug on the console-st and the power plug on the netCF are
effectively Y-d together. So connecting the two power supplies
together and plugging into one of the jacks is effectively the same
thing.

So basically, as long as you're using the same voltage on both jacks,
then it should be fine.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Thanks Dave
So would the Gumstix standard 4v supply + the Gumstix optional 5v supply be
OK ?
Wayne

Dave Hylands wrote:
> 
> Hi Wayne,
> 
>> I have a Netstix 200xm-cf with a console-st board added temporarily.
>> Am using an Enfora GSM modem CF card and having reliability problems
>> Presumably this might be power ??
>> So can I plug TWO power supplies in - one to the net-cf board and one to
>> the
>> console-st board without frying anything ???
> 
> The power plug on the console-st and the power plug on the netCF are
> effectively Y-d together. So connecting the two power supplies
> together and plugging into one of the jacks is effectively the same
> thing.
> 
> So basically, as long as you're using the same voltage on both jacks,
> then it should be fine.
> 
> -- 
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> gumstix-users@...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> 
> 

-- 
View this message in context: http://www.nabble.com/Expansion-board-power-consumption-tp15208690p15221324.html
Sent from the Gumstix mailing list archive at Nabble.com.

Hi Wayne,

> Thanks Dave
> So would the Gumstix standard 4v supply + the Gumstix optional 5v supply be
> OK ?

I wouldn't recommend connecting a 4v and 5v up at the same time. Using
2 4v or 2 5v supplies should be fine.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

Since you don't plan on using the wifi you can simply unplug (physically
detach it) the wifi and you can even order the netwifi-uSD with out the wifi
module in future. 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Jay
Phillips
Sent: Thursday, January 31, 2008 1:31 PM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Thanks for those numbers.

I'm already tracking sensor draws separately, so the 100mA sounds better
than 250mA.

Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
possibility of shutting off the wired connection to save power since I won't
be using it.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 10:27 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a
locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Unfortunately it's the WiFi I need. I can't remove the wired i/f. Well, I
could. But it would probably void my warranty :)

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Marc
Humphreys
Sent: Friday, February 01, 2008 5:49 AM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Since you don't plan on using the wifi you can simply unplug (physically
detach it) the wifi and you can even order the netwifi-uSD with out the wifi
module in future. 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Jay
Phillips
Sent: Thursday, January 31, 2008 1:31 PM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Thanks for those numbers.

I'm already tracking sensor draws separately, so the 100mA sounds better
than 250mA.

Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
possibility of shutting off the wired connection to save power since I won't
be using it.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 10:27 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a
locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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Sorry Jay, I read wifi instead wired with regards to which interface you
planned to turn off. 

And to think I just paid $300 for my new glasses which I picked up
yesterday. I thought for that price they'd come with builtin "Read Right"
technology. 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Jay
Phillips
Sent: Friday, February 01, 2008 10:13 AM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Unfortunately it's the WiFi I need. I can't remove the wired i/f. Well, I
could. But it would probably void my warranty :)

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Marc
Humphreys
Sent: Friday, February 01, 2008 5:49 AM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Since you don't plan on using the wifi you can simply unplug (physically
detach it) the wifi and you can even order the netwifi-uSD with out the wifi
module in future. 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Jay
Phillips
Sent: Thursday, January 31, 2008 1:31 PM
To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] Expansion board power consumption

Thanks for those numbers.

I'm already tracking sensor draws separately, so the 100mA sounds better
than 250mA.

Ouch, didn't realize WiFi was so hungry. At some point I'll look into the
possibility of shutting off the wired connection to save power since I won't
be using it.

-----------------------------------------------------
Jay Phillips
Tronix LLC - http://tronixllc.com
 

-----Original Message-----
From: gumstix-users-bounces@...
[mailto:gumstix-users-bounces@...] On Behalf Of Dave
Hylands
Sent: Thursday, January 31, 2008 10:27 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Expansion board power consumption

Hi Jay,

On Jan 31, 2008 10:08 AM, Jay Phillips <jay.phillips@...> wrote:
> I know that "it depends". I was looking for some "order of magnitude" type
> of info.
>
> I put 250mA in the spreadsheet as a placeholder for now. Same for the
> netwifimicro-SD.

According to the datasheet for the ATMega128, an idle 8 MHz processor
draws 11 mA, and an active one draws 19 mA. They don't give numbers
for 16 MHz. So 50-100mA feels like a good number (for the whole
robostix board), plus whatever your sensors draw.

250 seems like a reasonable place to start for the netwifimicrosd
without a wifi module. With a wifi module, you'll want 600 - 700 mA.

> The big current draws are going to be the drive motors, with a
locked-shaft
> current of 5A.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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