RCX programmable brick : 470


Robotics / RCX / 470	469 \| 471

Subject:	Re: Drive R/C Servos with the RCX and pbForth (long)
Newsgroups:	lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx
Date:	Sat, 12 Feb 2000 06:52:15 GMT
Viewed:	666 times

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. 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? --Ben

Message has 2 Replies:

		RE: Drive R/C Servos with the RCX and pbForth (long)
(...) 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. By (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)

		Grabber Arm from 1.0
I have several 1.0 sets that I use with Smalltalk for a freshmen class in Computer Science. The grabber arm appears to be an ideal object to control and I would have most of the "extra" pieces needed per the instructions. I am not sure about the (...) (25 years ago, 12-Feb-00, to lugnet.robotics)

Message is in Reply To:

		Drive R/C Servos with the RCX and pbForth (long)
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 (...) (25 years ago, 12-Feb-00, to lugnet.robotics, lugnet.robotics.rcx.pbforth, lugnet.robotics.rcx)

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