ROBOLAB : 276


Robotics / RCX / ROBOLAB / 276	275 \| 277

Subject:	Re: Robolab, byte codes and assembler
Newsgroups:	lugnet.robotics, lugnet.robotics.rcx.robolab
Date:	Sun, 30 Nov 2003 17:10:37 GMT
Viewed:	3924 times

Could someone explain to me technically why this sort of of problem with the rotation sensor occurs? I know how quadrature shaft encoders are _supposed_ to work, and I can't see why this sort of thing should happen in the first place. >> Mark

Message has 2 Replies:

		Re: Robolab, byte codes and assembler
(...) The way I understand it, it's really not the sensor's fault. The RCX and firmware together either can't or doesn't deal with the ambiguous voltage levels sometimes returned during two of the four transitions. If the RCX were fast enough that (...) (21 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)

		Re: Robolab, byte codes and assembler
(...) They do work! But they are usually used with two quadrature outputs (hence the name), while on RCX only one wire is used and the 4 states are encoded as 4 voltages levels. (URL) (Image courtesy Michael Gasperi) The sequence (clockwise) is (...) (21 years ago, 30-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab, FTX)

Message is in Reply To:

		Re: Robolab, byte codes and assembler
Following up from my earlier post, I have completed a firmware patch for the rotation sensors. This post contains the patch with installation instructions followed by a technical description. A long post but hopefully more than made up by the value (...) (21 years ago, 29-Nov-03, to lugnet.robotics, lugnet.robotics.rcx.robolab)

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