[oopic] Re: Single 6V battery constraint

Thanks,
Will proceed accordingly!

--- In oopic@yahoogroups.com, Andrew Porrett <slicerwizard@...> wrote:
>
> You can make it work by powering the servos directly from the four
> battery cells and powering the micro through a low-dropout 5 volt
> regulator like so:
>
>
> +6V--------+-----LP2954-----+--------micro
> | | |
> 1uF C | C large cap (a few thousand uF)
> | | |
> battery | | |
> ground-----+--------+-------+--------micro ground
>
>
> The connection to the micro goes directly to the OOPic's 5V rail,
NOT
> to the OOPic's voltage regulator input. Make sure that the only
> things being powered by this circuit are the micro and its EEPROM.
>
> The large cap on the regulator's output keeps the OOPic running
> during any brief dropouts (like heavily loaded servos starting up).
>
>
> You could also try it like this and see which works better for you:
>
>
> diode
> +6V----->|---+-----LP2954-----+--------micro
> | | |
> large cap C | C 1 or 2 uF
> | | |
> battery | | |
> ground-------+--------+-------+--------micro ground
>
>
> The diode can be any general purpose diode (like a 1N4001), but if
> you can get one with a lower voltage drop, it would be better.
>
> Personally, I would go with the first circuit, since it will run on
> lower battery voltage.
>
>
> Links:
>
> <http://www.national.com/mpf/LP/LP2954.html>
>
> <http://www.mouser.com/search/refine.aspx?Ntt=5985-85-25V6800>
>
>
> At 01:24 PM 11/4/2007, pvbeachdiver wrote:
> >Clarification/additional information:
> >
> >Project will need only 2 standard servos, modified for continuous
use,
> >(for the drive train)
> >
> > e.g. HiTec HS 322 or 422,
> >operating voltage 4.8 - 6.0 V,
> >current drain 7.7 mA/idle and 180 mA no load operation;
> >
> >Batteries constrained to 4 "common, commercially available" cells
> >
> >==> Alkaline D cells x 4 = 6V
> >
> >
> >Thanks!
>

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