Hi, It looks like you don't think that the end-of-charge voltage is above the nominal voltage. On the schematics given in the link hereafter, it would be safer to put a zener diode across the lower resistor of the divider, to protect the controller.
Le Jeudi 8 Mars 2007 21:51, Rod Boyce a écrit : > Markos, > > It is very simple I have done this many times in my days job, use a > resistive divider and work out the error by calibrating the input and > fix any error in software. One thing you have to be careful of is that > you monitor the temperature as well as many resistors vary their > resistance with temperature, but it depends on your application if you > are charging lead acid batteries then you may only have to calibrate the > circuit between the usable voltage range of interest. > > Have a look at > http://www.angelfire.com/electronic/hayles/charge1fig3.html note the > divide by 4 voltage sense connecting to the ADC input of the PIC > micro-controller. > > Regards, > Rod > > Markos wrote: > > Hi guys, > > maybe this is a little offtopic, but i'm sure you could > > help me. I'm implementing a simple battery charger, and I need to > > messaure voltages ranges from 0 to 12 V. > > ¿Could I use the PIC integrated ADC to messaure above 5 V (provided that > > I use the voltage reference pins tied to 0 and 12 V, for example)? Most > > external ADC have a 0 to 5V input range.... > > How would you guys solve this? Any Ideas? > > > > Thanks in advance. > > > > > > ------------------------------------------------------------------------- > > 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 > > _______________________________________________ > > Sdcc-user mailing list > > Sdcc-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/sdcc-user > > ------------------------------------------------------------------------- > 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 > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user -- Never jump into a loop! ------------------------------------------------------------------------- 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 _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
