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> > In lugnet.robotics, Ralph Hempel writes:
> > > Well, after a few hours of crunching away at the problem, I
> > > now have pbForth code to allow you to control and hold a servo
> > > in up to 100 positions.
Then Ben Jackson wrote:
> > If you're using a custom motor driver in pbForth, why use the inverter circuit
> > at all? Why not just generate the desired waveform directly? Is there not
> > enough current to drive the servo that way?
>
> No, the servo needs power to the + and ground terminals to drive
> the motor to the setpoint indicated by the signal wire. If I don't
> invert the signal there is no power for about 30msec and only
> 1 or 2 msec ov voltage on the motor port.
I should add here that no external power source is necessary to drive
the servo. This is important since a micro or miniservo and an SMT
version of the driver can be made to fit INSIDE a space similar to
a worm gear box (6588 in LDraw).
I'm looking for packaging ideas that will allow a few different
mounting options for the servos. Three different options are
needed:
1. Servo shaft comes out the top of a brick
2. Servo shaft comes out the bottom of a brick
3. Servo shaft comes out the side of a brick
I think that using Technic beams or even half-beams (look out for
Cyberslam on clearnace) will give the best mounting.
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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