Re: [Sdcc-user] [OT] - ADC Ideas

[Jean-Paul <tch...@fr...>]

Hi,

It looks like you don't think that the end-of-charge voltage is above the=20
nominal voltage.
On the schematics given in the link hereafter, it would be safer to put a=20
zener diode across the lower resistor of the divider, to protect the=20
controller.

Le Jeudi 8 Mars 2007 21:51, Rod Boyce a =E9crit=A0:
> 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.
> > =BFCould I use the PIC integrated ADC to messaure above 5 V (provided t=
hat
> > 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.
> >
> >
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