4V drop certainly suggests that this won't work, but what I'm not
understanding is why the motors are flying at 127, but not moving at 126. I
think I have a misconception as to how the output values from the OOPic
translate into motor speed.
It sounds like what I need is a higher voltage battery pack, which I think I
can fit in the space I have. What is still puzzling me, though, is the
radically different behavior at such close values. What is the relationship
between the output number and motor speed? Is there one?
I haven't been paying much attention to this piece of the picture, and have
some learning to do on motors and drive systems, so any information or links
would almost certainly be valuable to me.
> <What is the voltage rating of the motor? What is the voltage of the
> motor power source? Have you accounted for the internal voltage drop
> of the driver chip? There will be a 4V internal drop at 1A of load.
>
> Look at VOH and VOL here
> http://www.makingthings.com/resources/datasheets/SN754410NE_slrs007b.pdf
> Page 3 near top of electrical characteristics table.
>
> Check the voltage at the motor...
>
> Richard
>
>
>
>
--
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