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Ralph - I'm interested in the use of servos with the RCX, but I have
no interest in learning the quirks of another computer language. I'm
already a bit familiar with Visual Basic,and control the RCX with it.
Can your pbForth solution be duplicated with VB? Also, Have you ever
thought about doing up a small batch of PC boards for your interface?
Thanks --- John.
On Sat, 12 Feb 2000 03:34:24 GMT, "Ralph Hempel" <rhempel@bmts.com>
wrote:
> Hi again everyone!
>
> A few days ago I announced that I had developed a nice
> little circuit using easily available parts that would let
> you connect servos to the RCX - with no external batteries
> or microprocessors or anything!
>
> At that time, I said that you could only control the servo
> to one of two positions.
>
> 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. If you only want to MOVE the servo
> and not hold the position, you can drive two servos from
> one RCX port!
>
> This makes controling pneumatics really easy!!!!
>
> Here's the URL again for anyone that missed it the first time.
>
> <http://www.hempeldesigngroup.com/lego/servos/index.html>
>
> Based on the deafening silence the last post was greeted with,
> I have to assume nobody is really interested in driving servos
> with the RCX. If so, I have lots of stuff I should be doing this
> weekend like flooding my rink and making sure I pick up something
> for my better half for Valentine's Day.
>
> If there are some LUGnuts out there that really want to try to
> drive servos, I can package up and release an new version of pbFORTH.
>
> *** I'm especially looking for suggestions for applications, neat
> ideas for servo housings (John Barnes has me off to a good start)
> and discussions on hacking LEGO or how far we should go with
> non-standard parts...
>
> Here's the minimal code to get servos working once you have pbForth
> in your RCX:
>
> RCX_INIT \ Initialize the RCX interrupt systems
> SERVO_INIT \ Initialize the servo subsystem
>
> 50 0 SERVO_SET \ Set the servo on port A to 50%
> 20 0 SERVO_SET \ Set the servo on port A to 20%
>
> \ If you build the circuit with a pair of rectifying diodes
> missing, you can drive a second servo on the same port like so:
>
> -50 0 SERVO_SET
>
> \ To stop driving servos on the port and start driving motors
>
> 0 0 SERVO_SET \ Stop driving the servo on port A
> 7 1 0 MOTOR_SET \ Set the motor on port A to full forward power
>
> It really is a piece of cake. The pbForth system is interactive.
> You don't compile code, you type it or let your terminal emulator
> send it for you!!!!
>
> As always, comments are welcome.
>
> Cheers,
>
> Ralph Hempel - P.Eng
>
> --------------------------------------------------------
> Check out pbFORTH for LEGO Mindstorms at:
> <http://www.hempeldesigngroup.com/lego/pbFORTH>
> --------------------------------------------------------
> Reply to: rhempel at bmts dot com
> --------------------------------------------------------
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