Subject:
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Re: Straight moving with only one rotation sensor
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Fri, 11 Jun 2004 03:12:29 GMT
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Viewed:
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5000 times
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I did this in the past (since disassembled the bot) and found it to be
quite reliable; except on slippery surfaces and carpet. :)
The trick that I employed was to gear-up the rotation sensor. This
causes the rotation sensor to detect even a slight difference between
the motor outputs (although it generally increases the space needed)
Also, you should be able to get fairly reliable turns (45 degree, 90,
180, etc...)
I am interested in seeing pictures when you are done; and updates to the
program!
// Joe
http://www.calledtoconstruct.com
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:
>
> #pragma init myinit
>
> void myinit()
> {
> SetPower(OUT_A+OUT_B+OUT_C, 7);
> SetDirection(OUT_A+OUT_B+OUT_C, OUT_REV);
> }
>
> task main()
> {
> SetSensorType(SENSOR_3, SENSOR_TYPE_ROTATION);
> SetSensorMode(SENSOR_3, SENSOR_MODE_ROTATION);
> int sensorval;
> while(true)
> {
> sensorval=SensorValue(2)/2;
> if(sensorval > 0)
> {
> On(OUT_A);
> Off(OUT_C);
> }
> else if(sensorval < 0)
> {
> Off(OUT_A);
> On(OUT_C);
> }
> else
> {
> On(OUT_A + OUT_C);
> Wait(10);
> }
> }
> }
>
> LMKWYT
>
> --
> - Nicolas Alvarez
> nicoalvar0.no.spam@hotmail.com
>
>
>
>
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Message is in Reply To:
 | | Straight moving with only one rotation sensor
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| 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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