From: vwyodapink <vwy...@gm...> - 2010-08-19 19:58:42
|
I have finally got my overo running from my lipos. What I would like to know how to do or if its even possible. Would I be able to use a pin on summit to monitor the battery voltage coming from my lipos balancing plug? So that way I could monitor the voltage on each cell from the pack. Also if this is possible, can I monitor multiple lipo's in the same manner from their balance port? I tried doing some searching but not even sure what or where to look for this one. The voltages of my batteries are below. The main one I want to monitor is 22.2V -- This is the only one actually powering the gumstix. The others if possible are 11.1V Thanks for any info or help on this one. ----- Just a beginner trying to learn his way around. -- View this message in context: http://old.nabble.com/Monitoring-battery-voltage-from-lipo%27s-tp29485913p29485913.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Alex G. <al...@al...> - 2010-08-19 22:32:35
|
On 20/08/2010 5:58 AM, vwyodapink wrote: > ero running from my lipos. What I would like to know > how to do or if its even possible. Would I be able to use a pin on summit to > monitor the battery voltage coming from my lipos balancing plug? So that way > I could monitor the voltage on each cell from the pack. Also if this is > possible, can I monitor multiple lipo's in the same manner from their > balance port? I tried doing some searching but not even sure what or where > to look for this one. The voltages of my batteries are below. I2C or spi adcs ? or use the onbard adc's via resistor network May make more sense to use a small micro (avr , pic or arm7/arm cortex M) to do the monitoring then send the data via rs232 or spi/i2c or via can(can to usb - usb on overo end) Alex -- UTS CRICOS Provider Code: 00099F DISCLAIMER: This email message and any accompanying attachments may contain confidential information. If you are not the intended recipient, do not read, use, disseminate, distribute or copy this message or attachments. If you have received this message in error, please notify the sender immediately and delete this message. Any views expressed in this message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views the University of Technology, Sydney. Before opening any attachments, please check them for viruses and defects. |
From: J. L. <vwy...@gm...> - 2010-08-19 22:36:49
|
Thanks I will have to research more but sounds like its above my head to do this :P On Thu, Aug 19, 2010 at 3:32 PM, Alex Gibson <al...@al...> wrote: > On 20/08/2010 5:58 AM, vwyodapink wrote: >> ero running from my lipos. What I would like to know >> how to do or if its even possible. Would I be able to use a pin on summit to >> monitor the battery voltage coming from my lipos balancing plug? So that way >> I could monitor the voltage on each cell from the pack. Also if this is >> possible, can I monitor multiple lipo's in the same manner from their >> balance port? I tried doing some searching but not even sure what or where >> to look for this one. The voltages of my batteries are below. > > > I2C or spi adcs ? > > or use the onbard adc's via resistor network > > May make more sense to use a small micro (avr , pic or arm7/arm cortex > M) to do the monitoring > then send the data via rs232 or spi/i2c or via can(can to usb - usb on > overo end) > > Alex > > -- > UTS CRICOS Provider Code: 00099F > DISCLAIMER: This email message and any accompanying attachments may contain > confidential information. If you are not the intended recipient, do not > read, use, disseminate, distribute or copy this message or attachments. If > you have received this message in error, please notify the sender > immediately and delete this message. Any views expressed in this message > are those of the individual sender, except where the sender expressly, and > with authority, states them to be the views the University of Technology, > Sydney. Before opening any attachments, please check them for viruses and > defects. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Alex G. <al...@al...> - 2010-08-19 23:13:54
|
Easiest would be something like an arduino and talk to overo via rs232. Arduino (simplified c/java cross for avr's) is very easy to use sparkfun sells a lot http://www.sparkfun.com/commerce/categories.php?c=103 See their tutorials and the arduino tutorials http://www.sparkfun.com/commerce/tutorials.php http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=195 http://www.arduino.cc/en/Tutorial/HomePage You could just use one of the onboard adc's via a resistor netowrk to drop the maxium battery output voltage to a level suitable for the adc to read. If the batteries max voltage is 25V The adc's max input voltage is 2.5V Then you need a resistor network that divides the voltage by 10. http://en.wikipedia.org/wiki/Voltage_divider If my heads working correctly this morning if you pick R1 = 1k R2 = R1 / ((Vin/Vout) - 1) R2 should be approx 112ohms to give a max output of 2.5V Try this http://www.raltron.com/cust/tools/voltage_divider.asp On 20/08/2010 8:32 AM, Alex Gibson wrote: > On 20/08/2010 5:58 AM, vwyodapink wrote: >> ero running from my lipos. What I would like to know >> how to do or if its even possible. Would I be able to use a pin on summit to >> monitor the battery voltage coming from my lipos balancing plug? So that way >> I could monitor the voltage on each cell from the pack. Also if this is >> possible, can I monitor multiple lipo's in the same manner from their >> balance port? I tried doing some searching but not even sure what or where >> to look for this one. The voltages of my batteries are below. > > I2C or spi adcs ? > > or use the onbard adc's via resistor network > > May make more sense to use a small micro (avr , pic or arm7/arm cortex > M) to do the monitoring > then send the data via rs232 or spi/i2c or via can(can to usb - usb on > overo end) > > Alex > > -- > UTS CRICOS Provider Code: 00099F > DISCLAIMER: This email message and any accompanying attachments may contain > confidential information. If you are not the intended recipient, do not > read, use, disseminate, distribute or copy this message or attachments. If > you have received this message in error, please notify the sender > immediately and delete this message. Any views expressed in this message > are those of the individual sender, except where the sender expressly, and > with authority, states them to be the views the University of Technology, > Sydney. Before opening any attachments, please check them for viruses and > defects. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users -- UTS CRICOS Provider Code: 00099F DISCLAIMER: This email message and any accompanying attachments may contain confidential information. If you are not the intended recipient, do not read, use, disseminate, distribute or copy this message or attachments. If you have received this message in error, please notify the sender immediately and delete this message. Any views expressed in this message are those of the individual sender, except where the sender expressly, and with authority, states them to be the views the University of Technology, Sydney. Before opening any attachments, please check them for viruses and defects. |
From: J. L. <vwy...@gm...> - 2010-08-19 23:30:06
|
I have a few arduinos already that I am using. Just was not aware of how to properly go about reading the actual voltage of my battery and not the incoming stepped down power I use to power it. I was kind of hoping the balance connectors would just be at the voltage of each pack and I could some how easily tap off that. Your last two posts have given me enough to google more and see what I can come up with. Thanks a million for a huge jump start I really appreciate it and will post back with what I come up with and see if I am headed the right way. On Thu, Aug 19, 2010 at 4:13 PM, Alex Gibson <al...@al...> wrote: > Easiest would be something like an arduino and talk to overo via rs232. > > Arduino (simplified c/java cross for avr's) is very easy to use > > sparkfun sells a lot > http://www.sparkfun.com/commerce/categories.php?c=103 > > See their tutorials and the arduino tutorials > http://www.sparkfun.com/commerce/tutorials.php > http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=195 > http://www.arduino.cc/en/Tutorial/HomePage > > > You could just use one of the onboard adc's via a resistor netowrk > to drop the maxium battery output voltage to a level suitable for the > adc to read. > > If the batteries max voltage is 25V > > The adc's max input voltage is 2.5V > > Then you need a resistor network that divides the voltage by 10. > http://en.wikipedia.org/wiki/Voltage_divider > > > If my heads working correctly this morning > if you pick > R1 = 1k > > R2 = R1 / ((Vin/Vout) - 1) > > R2 should be approx 112ohms to give a max output of 2.5V > > Try this > http://www.raltron.com/cust/tools/voltage_divider.asp > > On 20/08/2010 8:32 AM, Alex Gibson wrote: >> On 20/08/2010 5:58 AM, vwyodapink wrote: >>> ero running from my lipos. What I would like to know >>> how to do or if its even possible. Would I be able to use a pin on summit to >>> monitor the battery voltage coming from my lipos balancing plug? So that way >>> I could monitor the voltage on each cell from the pack. Also if this is >>> possible, can I monitor multiple lipo's in the same manner from their >>> balance port? I tried doing some searching but not even sure what or where >>> to look for this one. The voltages of my batteries are below. >> >> I2C or spi adcs ? >> >> or use the onbard adc's via resistor network >> >> May make more sense to use a small micro (avr , pic or arm7/arm cortex >> M) to do the monitoring >> then send the data via rs232 or spi/i2c or via can(can to usb - usb on >> overo end) >> >> Alex >> >> -- >> UTS CRICOS Provider Code: 00099F >> DISCLAIMER: This email message and any accompanying attachments may contain >> confidential information. If you are not the intended recipient, do not >> read, use, disseminate, distribute or copy this message or attachments. If >> you have received this message in error, please notify the sender >> immediately and delete this message. Any views expressed in this message >> are those of the individual sender, except where the sender expressly, and >> with authority, states them to be the views the University of Technology, >> Sydney. Before opening any attachments, please check them for viruses and >> defects. >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by >> >> Make an app they can't live without >> Enter the BlackBerry Developer Challenge >> http://p.sf.net/sfu/RIM-dev2dev >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > -- > UTS CRICOS Provider Code: 00099F > DISCLAIMER: This email message and any accompanying attachments may contain > confidential information. If you are not the intended recipient, do not > read, use, disseminate, distribute or copy this message or attachments. If > you have received this message in error, please notify the sender > immediately and delete this message. Any views expressed in this message > are those of the individual sender, except where the sender expressly, and > with authority, states them to be the views the University of Technology, > Sydney. Before opening any attachments, please check them for viruses and > defects. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: alxx <al...@al...> - 2010-08-19 23:49:53
|
> Hi Alex, > > Please do not hook 1K + 112 ohms to your 25V battery pack. This will > lead to a constant draw of around 22mA = 0.56W. > > This will quickly discharge your battery pack. In practice, it is > better to use a higher-value network (1M or so total), along with a > MOSFET to ground the bottom end. When the system is off, you won't > have a parasitic draw. :) > Not the best example values but was just trying to give a quick example to show how to work it out. On the project I'm using batteries for (with overo), I don't worry about monitoring the battery, just have a low voltage cut off that has to be manually reset. Alex |
From: alxx <al...@al...> - 2010-08-20 00:12:31
|
> Alex would you mind posting any information about how you made the LVC > you use in your project? I have been wondering about those as well and > like that yours has to be manually reset. If its a hassle no worries. > > Using the ADC on the summit seems difficult from what I read. But does > sound like the cleanest solution. These are the times I wish I was an > electrical engineer so I actually knew what I needed and how to make > it :P > > And again I appreciate the examples and help > The circuit I'm using isn't going to be much use for you as I'm using sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . Some of the newer regulators (switch mode) have low voltage cut outs builtin. See Low-battery voltage cutoff consumes just 1 mA http://www.edn.com/archives/1998/091198/19di.htm http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf Just pick the version of the MN1380 that gives the voltage level you want. solarbotics sells them(in the US) as does small parts and bearings in Australia http://www.solarbotics.com/products/1381/ For another similar circuit to the bottom circuit on this page except using it to control the output(power) via a solid state relay. http://www.siliconchip.com.au/cms/A_104378/article.html Alex |
From: John A. <jal...@sp...> - 2010-08-23 17:33:38
|
Check out the DS2745 battery monitor from Dallas Semiconductor http://www.maxim-ic.com/datasheet/index.mvp/id/4994 It connects via i2c and provides voltage, current, and temperature. Regards On Fri, 2010-08-20 at 21:23 -0700, vwyodapink wrote: > Thanks again Alex I was able to get it working from an arduino and will be > interfacing it by means of i2c to my overo. > > Probably not the best way but seemed and worked out to be the easiest way > for me > > > > Alex Gibson-3 wrote: > > > >> Alex would you mind posting any information about how you made the LVC > >> you use in your project? I have been wondering about those as well and > >> like that yours has to be manually reset. If its a hassle no worries. > >> > >> Using the ADC on the summit seems difficult from what I read. But does > >> sound like the cleanest solution. These are the times I wish I was an > >> electrical engineer so I actually knew what I needed and how to make > >> it :P > >> > >> And again I appreciate the examples and help > >> > > > > The circuit I'm using isn't going to be much use for you as I'm using > > sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . > > > > Some of the newer regulators (switch mode) have low voltage cut outs > > builtin. > > > > See > > Low-battery voltage cutoff consumes just 1 mA > > http://www.edn.com/archives/1998/091198/19di.htm > > http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf > > > > Just pick the version of the MN1380 that gives the voltage level you want. > > solarbotics sells them(in the US) as does small parts and bearings in > > Australia > > http://www.solarbotics.com/products/1381/ > > > > For another > > similar circuit to the bottom circuit on this page > > except using it to control the output(power) via a solid state relay. > > http://www.siliconchip.com.au/cms/A_104378/article.html > > > > Alex > > > > > > > > ------------------------------------------------------------------------------ > > This SF.net email is sponsored by > > > > Make an app they can't live without > > Enter the BlackBerry Developer Challenge > > http://p.sf.net/sfu/RIM-dev2dev > > _______________________________________________ > > gumstix-users mailing list > > gum...@li... > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > > > ----- > Just a beginner trying to learn his way around. |
From: J. L. <vwy...@gm...> - 2010-08-23 17:43:13
|
Looks like a good chip but only does 1 cell lipo's I need to monitor 3 and 6 cell lipos. I came up with a way with an arduino to individually measure the voltage from the balance port on the battery since each is always below 5v and then I have the program add them together to get a ball park total on the battery as well as seeing each individual cells voltage. While it may not be the most accurate it works for now for me On Mon, Aug 23, 2010 at 10:14 AM, John Alfredo <jal...@sp...> wrote: > Check out the DS2745 battery monitor from Dallas Semiconductor > > http://www.maxim-ic.com/datasheet/index.mvp/id/4994 > > It connects via i2c and provides voltage, current, and temperature. > > Regards > > On Fri, 2010-08-20 at 21:23 -0700, vwyodapink wrote: >> Thanks again Alex I was able to get it working from an arduino and will be >> interfacing it by means of i2c to my overo. >> >> Probably not the best way but seemed and worked out to be the easiest way >> for me >> >> >> >> Alex Gibson-3 wrote: >> > >> >> Alex would you mind posting any information about how you made the LVC >> >> you use in your project? I have been wondering about those as well and >> >> like that yours has to be manually reset. If its a hassle no worries. >> >> >> >> Using the ADC on the summit seems difficult from what I read. But does >> >> sound like the cleanest solution. These are the times I wish I was an >> >> electrical engineer so I actually knew what I needed and how to make >> >> it :P >> >> >> >> And again I appreciate the examples and help >> >> >> > >> > The circuit I'm using isn't going to be much use for you as I'm using >> > sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . >> > >> > Some of the newer regulators (switch mode) have low voltage cut outs >> > builtin. >> > >> > See >> > Low-battery voltage cutoff consumes just 1 mA >> > http://www.edn.com/archives/1998/091198/19di.htm >> > http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf >> > >> > Just pick the version of the MN1380 that gives the voltage level you want. >> > solarbotics sells them(in the US) as does small parts and bearings in >> > Australia >> > http://www.solarbotics.com/products/1381/ >> > >> > For another >> > similar circuit to the bottom circuit on this page >> > except using it to control the output(power) via a solid state relay. >> > http://www.siliconchip.com.au/cms/A_104378/article.html >> > >> > Alex >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > This SF.net email is sponsored by >> > >> > Make an app they can't live without >> > Enter the BlackBerry Developer Challenge >> > http://p.sf.net/sfu/RIM-dev2dev >> > _______________________________________________ >> > gumstix-users mailing list >> > gum...@li... >> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > >> > >> >> >> ----- >> Just a beginner trying to learn his way around. > > > > ------------------------------------------------------------------------------ > Sell apps to millions through the Intel(R) Atom(Tm) Developer Program > Be part of this innovative community and reach millions of netbook users > worldwide. Take advantage of special opportunities to increase revenue and > speed time-to-market. Join now, and jumpstart your future. > http://p.sf.net/sfu/intel-atom-d2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Robert V. IV <ro...@io...> - 2010-08-23 17:48:36
|
Hi JL, That is probably one of the best ways to get voltage. Anyhow, you want to know if they are becoming unbalanced as otherwise you're going to have problems... You need to monitor the voltage of the lowest to determine when to shut off, as otherwise you will under-voltage it and cause damage. Robert Vogt IV CEO IOSiX, LLC 2375 Parkwood Ave Ypsilanti, MI 48198 ro...@io... P: 734-730-9690 F: 734-482-2337 On Mon, Aug 23, 2010 at 1:43 PM, J. L. <vwy...@gm...> wrote: > Looks like a good chip but only does 1 cell lipo's I need to monitor 3 > and 6 cell lipos. I came up with a way with an arduino to individually > measure the voltage from the balance port on the battery since each is > always below 5v and then I have the program add them together to get a > ball park total on the battery as well as seeing each individual cells > voltage. While it may not be the most accurate it works for now for me > > On Mon, Aug 23, 2010 at 10:14 AM, John Alfredo <jal...@sp...> wrote: >> Check out the DS2745 battery monitor from Dallas Semiconductor >> >> http://www.maxim-ic.com/datasheet/index.mvp/id/4994 >> >> It connects via i2c and provides voltage, current, and temperature. >> >> Regards >> >> On Fri, 2010-08-20 at 21:23 -0700, vwyodapink wrote: >>> Thanks again Alex I was able to get it working from an arduino and will be >>> interfacing it by means of i2c to my overo. >>> >>> Probably not the best way but seemed and worked out to be the easiest way >>> for me >>> >>> >>> >>> Alex Gibson-3 wrote: >>> > >>> >> Alex would you mind posting any information about how you made the LVC >>> >> you use in your project? I have been wondering about those as well and >>> >> like that yours has to be manually reset. If its a hassle no worries. >>> >> >>> >> Using the ADC on the summit seems difficult from what I read. But does >>> >> sound like the cleanest solution. These are the times I wish I was an >>> >> electrical engineer so I actually knew what I needed and how to make >>> >> it :P >>> >> >>> >> And again I appreciate the examples and help >>> >> >>> > >>> > The circuit I'm using isn't going to be much use for you as I'm using >>> > sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . >>> > >>> > Some of the newer regulators (switch mode) have low voltage cut outs >>> > builtin. >>> > >>> > See >>> > Low-battery voltage cutoff consumes just 1 mA >>> > http://www.edn.com/archives/1998/091198/19di.htm >>> > http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf >>> > >>> > Just pick the version of the MN1380 that gives the voltage level you want. >>> > solarbotics sells them(in the US) as does small parts and bearings in >>> > Australia >>> > http://www.solarbotics.com/products/1381/ >>> > >>> > For another >>> > similar circuit to the bottom circuit on this page >>> > except using it to control the output(power) via a solid state relay. >>> > http://www.siliconchip.com.au/cms/A_104378/article.html >>> > >>> > Alex >>> > >>> > >>> > >>> > ------------------------------------------------------------------------------ >>> > This SF.net email is sponsored by >>> > >>> > Make an app they can't live without >>> > Enter the BlackBerry Developer Challenge >>> > http://p.sf.net/sfu/RIM-dev2dev >>> > _______________________________________________ >>> > gumstix-users mailing list >>> > gum...@li... >>> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> > >>> > >>> >>> >>> ----- >>> Just a beginner trying to learn his way around. >> >> >> >> ------------------------------------------------------------------------------ >> Sell apps to millions through the Intel(R) Atom(Tm) Developer Program >> Be part of this innovative community and reach millions of netbook users >> worldwide. Take advantage of special opportunities to increase revenue and >> speed time-to-market. Join now, and jumpstart your future. >> http://p.sf.net/sfu/intel-atom-d2d >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > ------------------------------------------------------------------------------ > Sell apps to millions through the Intel(R) Atom(Tm) Developer Program > Be part of this innovative community and reach millions of netbook users > worldwide. Take advantage of special opportunities to increase revenue and > speed time-to-market. Join now, and jumpstart your future. > http://p.sf.net/sfu/intel-atom-d2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: J. L. <vwy...@gm...> - 2010-08-23 17:55:45
|
WOW I am shocked I got it in one of better ways of doing it. I knew about the having to watch each cell part thats why I figured would be best to display all cell on the battery and a total voltage and a lowest voltage. Prob a tad overkill but I am a paranoid type. Now to just get my arduinos working with the overo. On Mon, Aug 23, 2010 at 10:47 AM, Robert Vogt IV <ro...@io...> wrote: > Hi JL, > > That is probably one of the best ways to get voltage. Anyhow, you > want to know if they are becoming unbalanced as otherwise you're going > to have problems... You need to monitor the voltage of the lowest to > determine when to shut off, as otherwise you will under-voltage it and > cause damage. > > > Robert Vogt IV > CEO > IOSiX, LLC > 2375 Parkwood Ave > Ypsilanti, MI 48198 > ro...@io... > P: 734-730-9690 > F: 734-482-2337 > > > > On Mon, Aug 23, 2010 at 1:43 PM, J. L. <vwy...@gm...> wrote: >> Looks like a good chip but only does 1 cell lipo's I need to monitor 3 >> and 6 cell lipos. I came up with a way with an arduino to individually >> measure the voltage from the balance port on the battery since each is >> always below 5v and then I have the program add them together to get a >> ball park total on the battery as well as seeing each individual cells >> voltage. While it may not be the most accurate it works for now for me >> >> On Mon, Aug 23, 2010 at 10:14 AM, John Alfredo <jal...@sp...> wrote: >>> Check out the DS2745 battery monitor from Dallas Semiconductor >>> >>> http://www.maxim-ic.com/datasheet/index.mvp/id/4994 >>> >>> It connects via i2c and provides voltage, current, and temperature. >>> >>> Regards >>> >>> On Fri, 2010-08-20 at 21:23 -0700, vwyodapink wrote: >>>> Thanks again Alex I was able to get it working from an arduino and will be >>>> interfacing it by means of i2c to my overo. >>>> >>>> Probably not the best way but seemed and worked out to be the easiest way >>>> for me >>>> >>>> >>>> >>>> Alex Gibson-3 wrote: >>>> > >>>> >> Alex would you mind posting any information about how you made the LVC >>>> >> you use in your project? I have been wondering about those as well and >>>> >> like that yours has to be manually reset. If its a hassle no worries. >>>> >> >>>> >> Using the ADC on the summit seems difficult from what I read. But does >>>> >> sound like the cleanest solution. These are the times I wish I was an >>>> >> electrical engineer so I actually knew what I needed and how to make >>>> >> it :P >>>> >> >>>> >> And again I appreciate the examples and help >>>> >> >>>> > >>>> > The circuit I'm using isn't going to be much use for you as I'm using >>>> > sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . >>>> > >>>> > Some of the newer regulators (switch mode) have low voltage cut outs >>>> > builtin. >>>> > >>>> > See >>>> > Low-battery voltage cutoff consumes just 1 mA >>>> > http://www.edn.com/archives/1998/091198/19di.htm >>>> > http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf >>>> > >>>> > Just pick the version of the MN1380 that gives the voltage level you want. >>>> > solarbotics sells them(in the US) as does small parts and bearings in >>>> > Australia >>>> > http://www.solarbotics.com/products/1381/ >>>> > >>>> > For another >>>> > similar circuit to the bottom circuit on this page >>>> > except using it to control the output(power) via a solid state relay. >>>> > http://www.siliconchip.com.au/cms/A_104378/article.html >>>> > >>>> > Alex >>>> > >>>> > >>>> > >>>> > ------------------------------------------------------------------------------ >>>> > This SF.net email is sponsored by >>>> > >>>> > Make an app they can't live without >>>> > Enter the BlackBerry Developer Challenge >>>> > http://p.sf.net/sfu/RIM-dev2dev >>>> > _______________________________________________ >>>> > gumstix-users mailing list >>>> > gum...@li... >>>> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >>>> > >>>> > >>>> >>>> >>>> ----- >>>> Just a beginner trying to learn his way around. >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Sell apps to millions through the Intel(R) Atom(Tm) Developer Program >>> Be part of this innovative community and reach millions of netbook users >>> worldwide. Take advantage of special opportunities to increase revenue and >>> speed time-to-market. Join now, and jumpstart your future. >>> http://p.sf.net/sfu/intel-atom-d2d >>> _______________________________________________ >>> gumstix-users mailing list >>> gum...@li... >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >> ------------------------------------------------------------------------------ >> Sell apps to millions through the Intel(R) Atom(Tm) Developer Program >> Be part of this innovative community and reach millions of netbook users >> worldwide. Take advantage of special opportunities to increase revenue and >> speed time-to-market. Join now, and jumpstart your future. >> http://p.sf.net/sfu/intel-atom-d2d >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> > > ------------------------------------------------------------------------------ > Sell apps to millions through the Intel(R) Atom(Tm) Developer Program > Be part of this innovative community and reach millions of netbook users > worldwide. Take advantage of special opportunities to increase revenue and > speed time-to-market. Join now, and jumpstart your future. > http://p.sf.net/sfu/intel-atom-d2d > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: Søren S. C. <li...@ss...> - 2010-09-05 13:46:24
|
Hi JL, > WOW I am shocked I got it in one of better ways of doing it. I knew > about the having to watch each cell part thats why I figured would be > best to display all cell on the battery and a total voltage and a > lowest voltage. Prob a tad overkill but I am a paranoid type. Now to > just get my arduinos working with the overo. Great that you found a working solution. For future reference I just thought I would make a link to a dedicated IC like: http://focus.ti.com/lit/ds/symlink/bq77910.pdf which I think as well can handle the job. TI have a lot of more stuff available at http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=analog&fami lyId=413&uiTemplateId=NODE_STRY_PGE_T, and Linear, Maxim (and most likely others as well) make a lot of similar great stuff being able to handle several stacked cells as well... Using one of these dedicated ICs makes it possible to do cell balancing (for some of them), meaning that they can charge a low voltage cell from higher voltage cells => You will run out of power from all cells simultaneously (of cause making a lot of assumptions :-) and thereby doesn't have to stop when the weakest cell is empty => Longer battery time :-) Best regards - Good luck Søren --- SSC Solutions ApS - Denmark - www.ssc-solutions.dk |
From: Robert V. IV <ro...@io...> - 2010-08-19 23:33:48
|
Hi Alex, Please do not hook 1K + 112 ohms to your 25V battery pack. This will lead to a constant draw of around 22mA = 0.56W. This will quickly discharge your battery pack. In practice, it is better to use a higher-value network (1M or so total), along with a MOSFET to ground the bottom end. When the system is off, you won't have a parasitic draw. :) Robert Vogt IV CEO IOSiX, LLC 2375 Parkwood Ave Ypsilanti, MI 48198 ro...@io... P: 734-730-9690 F: 734-482-2337 On Thu, Aug 19, 2010 at 7:13 PM, Alex Gibson <al...@al...> wrote: > Easiest would be something like an arduino and talk to overo via rs232. > > Arduino (simplified c/java cross for avr's) is very easy to use > > sparkfun sells a lot > http://www.sparkfun.com/commerce/categories.php?c=103 > > See their tutorials and the arduino tutorials > http://www.sparkfun.com/commerce/tutorials.php > http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=195 > http://www.arduino.cc/en/Tutorial/HomePage > > > You could just use one of the onboard adc's via a resistor netowrk > to drop the maxium battery output voltage to a level suitable for the > adc to read. > > If the batteries max voltage is 25V > > The adc's max input voltage is 2.5V > > Then you need a resistor network that divides the voltage by 10. > http://en.wikipedia.org/wiki/Voltage_divider > > > If my heads working correctly this morning > if you pick > R1 = 1k > > R2 = R1 / ((Vin/Vout) - 1) > > R2 should be approx 112ohms to give a max output of 2.5V > > Try this > http://www.raltron.com/cust/tools/voltage_divider.asp > > On 20/08/2010 8:32 AM, Alex Gibson wrote: >> On 20/08/2010 5:58 AM, vwyodapink wrote: >>> ero running from my lipos. What I would like to know >>> how to do or if its even possible. Would I be able to use a pin on summit to >>> monitor the battery voltage coming from my lipos balancing plug? So that way >>> I could monitor the voltage on each cell from the pack. Also if this is >>> possible, can I monitor multiple lipo's in the same manner from their >>> balance port? I tried doing some searching but not even sure what or where >>> to look for this one. The voltages of my batteries are below. >> >> I2C or spi adcs ? >> >> or use the onbard adc's via resistor network >> >> May make more sense to use a small micro (avr , pic or arm7/arm cortex >> M) to do the monitoring >> then send the data via rs232 or spi/i2c or via can(can to usb - usb on >> overo end) >> >> Alex >> >> -- >> UTS CRICOS Provider Code: 00099F >> DISCLAIMER: This email message and any accompanying attachments may contain >> confidential information. If you are not the intended recipient, do not >> read, use, disseminate, distribute or copy this message or attachments. If >> you have received this message in error, please notify the sender >> immediately and delete this message. Any views expressed in this message >> are those of the individual sender, except where the sender expressly, and >> with authority, states them to be the views the University of Technology, >> Sydney. Before opening any attachments, please check them for viruses and >> defects. >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by >> >> Make an app they can't live without >> Enter the BlackBerry Developer Challenge >> http://p.sf.net/sfu/RIM-dev2dev >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > -- > UTS CRICOS Provider Code: 00099F > DISCLAIMER: This email message and any accompanying attachments may contain > confidential information. If you are not the intended recipient, do not > read, use, disseminate, distribute or copy this message or attachments. If > you have received this message in error, please notify the sender > immediately and delete this message. Any views expressed in this message > are those of the individual sender, except where the sender expressly, and > with authority, states them to be the views the University of Technology, > Sydney. Before opening any attachments, please check them for viruses and > defects. > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: J. L. <vwy...@gm...> - 2010-08-19 23:56:46
|
Alex would you mind posting any information about how you made the LVC you use in your project? I have been wondering about those as well and like that yours has to be manually reset. If its a hassle no worries. Using the ADC on the summit seems difficult from what I read. But does sound like the cleanest solution. These are the times I wish I was an electrical engineer so I actually knew what I needed and how to make it :P And again I appreciate the examples and help On Thu, Aug 19, 2010 at 4:49 PM, alxx <al...@al...> wrote: >> Hi Alex, >> >> Please do not hook 1K + 112 ohms to your 25V battery pack. This will >> lead to a constant draw of around 22mA = 0.56W. >> >> This will quickly discharge your battery pack. In practice, it is >> better to use a higher-value network (1M or so total), along with a >> MOSFET to ground the bottom end. When the system is off, you won't >> have a parasitic draw. :) >> > > > Not the best example values but was just trying to give a quick > example to show how to work it out. > > On the project I'm using batteries for (with overo), I don't worry about > monitoring the battery, just have a low voltage cut off that has to be > manually reset. > > Alex > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |
From: vwyodapink <vwy...@gm...> - 2010-08-21 04:23:13
|
Thanks again Alex I was able to get it working from an arduino and will be interfacing it by means of i2c to my overo. Probably not the best way but seemed and worked out to be the easiest way for me Alex Gibson-3 wrote: > >> Alex would you mind posting any information about how you made the LVC >> you use in your project? I have been wondering about those as well and >> like that yours has to be manually reset. If its a hassle no worries. >> >> Using the ADC on the summit seems difficult from what I read. But does >> sound like the cleanest solution. These are the times I wish I was an >> electrical engineer so I actually knew what I needed and how to make >> it :P >> >> And again I appreciate the examples and help >> > > The circuit I'm using isn't going to be much use for you as I'm using > sealed lead acid batteries(gel cells) 6V 12Ah/24Ah . > > Some of the newer regulators (switch mode) have low voltage cut outs > builtin. > > See > Low-battery voltage cutoff consumes just 1 mA > http://www.edn.com/archives/1998/091198/19di.htm > http://www.edn.com/archives/1998/091198/pdfs/17d22531.pdf > > Just pick the version of the MN1380 that gives the voltage level you want. > solarbotics sells them(in the US) as does small parts and bearings in > Australia > http://www.solarbotics.com/products/1381/ > > For another > similar circuit to the bottom circuit on this page > except using it to control the output(power) via a solid state relay. > http://www.siliconchip.com.au/cms/A_104378/article.html > > Alex > > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ----- Just a beginner trying to learn his way around. -- View this message in context: http://old.nabble.com/Monitoring-battery-voltage-from-lipo%27s-tp29485913p29497348.html Sent from the Gumstix mailing list archive at Nabble.com. |