Wednesday, April 9, 2008

[oopic] Re: Motor Alternate Power Source

--- In oopic@yahoogroups.com, "jon_mark_go" <jonmarkgo@...> wrote:
>
> Or..more accurately for my situation, is it common that if a motor
> gets blown out, trying to operate it will heat up the power lines?
>

How, EXACTLY, are you driving the motor? Clearly it can not be
connected directly to the OOPic so I have to assume you have an H-
Bridge of some kind. Or is this just a modified servo? If so, it
has an internal H-Bridge.

Servos, when connected to the OOPic-R, with the power source jumpers
properly located, do not draw power from the regulator serving the
microcontroller. The only thing the OOPic does is provide a pulse to
the internal servo controller. Very little current and probably very
little risk. That's not to say that something very bad couldn't
happen but the way to prevent it is to put a 330 ohm resistor between
the OOPic output and the servo signal lead. This isn't easy on the R
board but it is included on the OOBOT controllers from

www.oricomtech.com

Sure, it is even LIKELY that trying to operate a defective motor will
heat up the power lines. And the battery and the traces on the
controller board. That's why fuses were invented.

Richard

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