Something to be careful when measuring batteries is the posibility of ground faults. You should put some kind of isolator in the circuit. I would look at something like: http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/KA331/?qs=sGAEpiMZZMsX%252bY3VKDPZyJCaoDxJE74rPXbbWqbQ96g%3d driving a http://www.us.liteon.com/downloads/LTV-817-827-847.PDF or maybe even an audio transformer over a twisted pair. Then you can use a counter 1-wire or arduino to record the voltage. Looking at the data sheet I think you could easily build this yourself if you have a soldering iron and some veroboard (It's all through hole stuff and cheap even in singles). You might also look at wireless, there are a number of cheap wireless boards out there on 37MHz and 2.4GHz.
njh On Sun, Jan 06, 2013 at 07:16:59PM -0800, Peter Hollenbeck wrote: > I want to measure the voltage of a 12 volt battery system: two 6 volt golf > cart batteries charged by micro hydro and solar. Remote, unattended. I have > an a2d card with serial interface that used to give me the voltage but it > stopped working. I would like to replace it with a 1wire solution. > I have looked at the DS2438 but as it is a chip I guess I need a breadboard > and at least 1wire and DC connectors, plus the voltage divider. > > I was hoping to find a kit or pre-built solution but maybe I could do it > from parts. > > Thanks for your reply. > Peter > Northern California > > On Sun, Jan 6, 2013 at 6:50 PM, p4trykx <[email protected]> wrote: > > > ** > > W dniu 07.01.2013 o 02:52 Peter Hollenbeck <[email protected]> pisze: > > > > > > Can someone suggest a a way to measure DC voltage in the range 10 to 14 > > volts? > > I know nothing about circuits but do have basic soldering skills and have > > built a few small kits. > > At one location I am using owfs to monitor solar, humidity and, barometric > > pressure using a a Raspberry Pi and HobbyBoards serial master and sensors. > > The voltage sensor would be on a a different Raspberry Pi. > > > > Thank you, > > Peter > > > > > > You can choose something from this > > > > http://para.maximintegrated.com/en/search.mvp?fam=batt_stat&374=1-Wire&tree=master > > I can remember the name but I think that the chip form barometer can > > measure up to 12V. > > > > What are you measuring? You can use a voltage divider(look at wikipedia) > > to lower the voltage for acceptable level not above 12V. > > > > > > -- > > p4trykx > > > > > > ------------------------------------------------------------------------------ > > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > > MVPs and experts. SALE $99.99 this month only -- learn more at: > > http://p.sf.net/sfu/learnmore_122412 > > _______________________________________________ > > Owfs-developers mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. SALE $99.99 this month only -- learn more at: > http://p.sf.net/sfu/learnmore_122412 > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122412 _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
