Robotics : 27362


Robotics / 27362	27361 \| 27363

Subject:	Re: Power Function control with RCX and BrickOS
Newsgroups:	lugnet.general, lugnet.technic, lugnet.trains, lugnet.robotics
Date:	Sat, 26 Jan 2008 18:28:20 GMT
Viewed:	2221 times

Thank you very much for that fine piece of software Bob!

After reading your post I immediately run in my LEGO room to grab an RCX and the IR tower to test your software. Well, I had to find out that I had not enough batteries at home and thus had to get some overpriced ones at the next gas station :-)

Download of the firmware as well as the program worked fine. The program runs without problems and the Bulldozer reacts immediately. Great!

I have a few issues though where I’d like to ask you for some hints:

The rotation sensor sets zero at the position it was during start of the program. By stepwise moving the axle in one direction, the PF motor runs first at max. speed and then gets slower and slower. So PWM works fine. But how can I change the program in a way that from zero position the speed increases when turning the axle of the rotation sensor? Currently it decreases stepwise from max. speed which makes it somewhat difficult to control the Bulldozer (or whatever model using the PF motors).
Furthermore I found out that turning the rotation sensor in one direction, the motor runs in for example forward direction. I thought by turning the connector plate on the sensor interface of the RCX would change direction of revolution of the motor when the sensor is turned in the same direction as before. Of course, I tried all four possible orientations of the connector, but the motor still turns always in the same direction when turning the axle of the rotation sensor forward? Is this the correct behaviour?
Finally, does it happen to you too, that the rotation sensors loose calibration very fast? Just after playing around for a few cycles (forward, backwards, forward...) The zero position is not at the same place any more.

If you could give me some hints on how to overcome these issues, this would be much appreciated. You will have to know that I am everything else than a Mindstorms professional :-)

Thanks again for your work

Beat

PS. My intention is to build a proper remote control with two mechanical joysticks, each coupled to two rotation sensors to be able to control all four functions of the Bulldozer at the same time.

Message has 1 Reply:

		Re: Power Function control with RCX and BrickOS
(...) Well this was just a quickly hacked out example program to show how to use the library function that i wrote. i realized at the time that the PWM started out at fastest and went to slowest but i had run out of steam and never really got back (...) (17 years ago, 26-Jan-08, to lugnet.general, lugnet.technic, lugnet.trains, lugnet.robotics, FTX)

Message is in Reply To:

		Power Function control with RCX and BrickOS
Now you can use your RCX to control LEGO Power Functions. That's right the RCX can act as a PF remote control but it can do something that the PF remote can't do yet. The RCX can do PWM with your PF reciever moduals. You do not need to install (...) (17 years ago, 25-Jan-08, to lugnet.general, lugnet.technic, lugnet.trains, lugnet.robotics, lugnet.announce, FTX) !

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