View this page "Power Management"

[Joseph Lopez]

Created a new page to deal with the batteries themselves since it
didn't really seem to belong in the charger section.

Click on http://groups.google.com/group/uhclseniorproj010/web/power-management
- or copy & paste it into your browser's address bar if that doesn't
work.

[zonemikel.com]

Use the pic, we have plenty of analogue inputs on the pic, not so many serial/digital inputs. Take the analogue reading from the battery and do your calculations on the pic, one wire + software ... no ic ! Do good, Be Well, Michael --- On Sat, 4/17/10, Joseph Lopez <jolo...@gmail.com> wrote:

[Joseph Lopez]

Awesome. One less thing for me to worry about. I might be able to
use the same input to determine the End-of-Charge for the batteries as
well, but that will depend on if the PIC might potentially be doing
something else at the same time, which would increase the time between
measurements. We'll see when we get to that point.

On Apr 17, 4:26 pm, "zonemikel.com" <zonetejasmi...@yahoo.com> wrote:
> Use the pic, we have plenty of analogue inputs on the pic, not so many serial/digital inputs. Take the analogue reading from the battery and do your calculations on the pic, one wire + software ... no ic !
>
> Do good, Be Well,
>
>           Michael
>

> --- On Sat, 4/17/10, Joseph Lopez <jolope...@gmail.com> wrote:

>
> From: Joseph Lopez <jolope...@gmail.com>
> Subject: View this page "Power Management"
> To: "UhclSeniorProj010" <uhclseni...@googlegroups.com>
> Date: Saturday, April 17, 2010, 3:27 PM
>
> Created a new page to deal with the batteries themselves since it
> didn't really seem to belong in the charger section.
>

> Click onhttp://groups.google.com/group/uhclseniorproj010/web/power-management

[zonemikel.com]

When its charging the battery it will be doing very little else. The thing i dont get is if we are charging how do we know when the battery is full ? Unless we are checking the voltage across some resistor then calculating the current flow. Or we could use temperature, its up to you.

Do good, Be Well, Michael

--- On Sat, 4/17/10, Joseph Lopez <jolo...@gmail.com> wrote:

[zonemikel.com]

So is anyone going to put the slides together and add a theme ? So far Trent and Joseph have done theres. So either Scott or Duc put it all together and add a theme. For what we are going to do next semster (the last slide) just add TBD for now.

Do good, Be Well, Michael

--- On Sat, 4/17/10, Joseph Lopez <jolo...@gmail.com> wrote:

[Joseph Lopez]

Three ways we could check to see when the battery is full. One is like
you said, monitoring the current flow going into the battery. If we're
able to implement this, then we should also be able to monitor the
current flowing out, which would give us a better estimate of the
operational time of the bot while it's running. The second is to check
the voltage drop. It'll be small, but I think we'll be able to have a
good enough resolution on the ADC to see the voltage drop once the
battery is fully charged. This also should give us a rough estimate as
to how much charge is left, but not really how much operational time is
left. And then the other is using temperature like you said. I haven't
decided yet, but if we use temperature, I could conceivably design the
circuit so that the temperature sensor cuts off the charging current
once it reaches a certain value. I haven't decided which way to go yet,
but I'm considering those possibilities.

Joseph

zonemikel.com wrote:
> When its charging the battery it will be doing very little else. The
> thing i dont get is if we are charging how do we know when the battery
> is full ? Unless we are checking the voltage across some resistor then
> calculating the current flow. Or we could use temperature, its up to you.
>
> Do good, Be Well,
> Michael
>

> --- On *Sat, 4/17/10, Joseph Lopez /<jolo...@gmail.com>/* wrote:
>
>
> From: Joseph Lopez <jolo...@gmail.com>
> Subject: Re: View this page "Power Management"
> To: "UhclSeniorProj010" <uhclseni...@googlegroups.com>
> Date: Saturday, April 17, 2010, 11:46 PM
>
> Awesome. One less thing for me to worry about. I might be able to
> use the same input to determine the End-of-Charge for the batteries as
> well, but that will depend on if the PIC might potentially be doing
> something else at the same time, which would increase the time between
> measurements. We'll see when we get to that point.
>
> On Apr 17, 4:26 pm, "zonemikel.com" <zonetejasmi...@yahoo.com

> </mc/compose?to=zonetejasmi...@yahoo.com>> wrote:
> > Use the pic, we have plenty of analogue inputs on the pic, not
> so many serial/digital inputs. Take the analogue reading from the
> battery and do your calculations on the pic, one wire + software
> ... no ic !
> >
> > Do good, Be Well,
> >
> > Michael
> >
> > --- On Sat, 4/17/10, Joseph Lopez <jolope...@gmail.com

[zonemikel.com]

sounds like checking across a resistor is best, that way we can check the current going in and out like you said. This would allow for very precise calculation of "time remaining" etc.

Do good, Be Well, Michael