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 Robotics / RCX / NQC / 1681
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Subject: 
Re: Straight moving with only one rotation sensor
Newsgroups: 
lugnet.robotics.rcx.nqc
Date: 
Thu, 10 Jun 2004 05:19:18 GMT
Viewed: 
5095 times
  
In lugnet.robotics.rcx.nqc, Nicolas Alvarez wrote:
Hi

I saw in the LEGO Mindstorms Web Page that many people made their robots with 2
motors go straight using one rotation sensor on each wheel and stopping the
correct motor until both sensors were equal.

I got Ultimate Accessory Set as a present some months ago and I wanted to make
robots go straight using only one rotation sensor. I made it using a
differential.

Here is the unfinished NQC program for it:

--
- Nicolas Alvarez
nicoalvar0.no.spam@hotmail.com

Sounds good.  I use a CyberMaster for the movement part of the robot because it
has tachos on each internal motor.  I modify the power settings for the motors
to keep the robot (reasonably) straight, rather than stop and start them.  If
you tried that what sort of results did you get?

For the CyberMaster I get good results for drives of about 20cm+ - shorter
drives tend not to balance out.

Of course, getting the wheels on each side to travel the same distance doesn't
mean you've gone straight :-)



Message has 1 Reply:
  Re: Straight moving with only one rotation sensor
 
Have you come across the adder/subtractor drive? Although it make the gear chain slightly more complex - it may mean you can leave out the sensor entirely. The drive has two inputs (A and B), and two outputs - one being A+B, and the other A-B. So if (...) (20 years ago, 10-Jun-04, to lugnet.robotics.rcx.nqc)

Message is in Reply To:
  Straight moving with only one rotation sensor
 
Hi I saw in the LEGO Mindstorms Web Page that many people made their robots with 2 motors go straight using one rotation sensor on each wheel and stopping the correct motor until both sensors were equal. I got Ultimate Accessory Set as a present (...) (20 years ago, 10-Jun-04, to lugnet.robotics.rcx.nqc)

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