[Urgent] How to make a probing car turn 90 degrees?

[shadowfax1127]

Hey guys. Bioloid newbie here. I adapted a probing car (4 wheels) which needs to turn in exact 90 degrees. Is there any way to programme the robot such that it will turn in exact right angles? Can I achieve that with this kit?

Thx!

[siempre.aprendiendo]

Of course, any angle you want. Well, almost, any angle between the valid range of the AX-12+, 0º - 300º. AX-12+ manual, page 16

"http://robosavvy.com/site/docs/Bioloid/AX-12(english).pdf"

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[StuartL]

Of course, any angle you want. Well, almost, any angle between the valid range of the AX-12+, 0º - 300º. AX-12+ manual, page 16

"http://robosavvy.com/site/docs/Bioloid/AX-12(english).pdf"

I think he's wanting to make sure that the robot turns 90 deg relative to the surface it's on.

That's a LOT harder. The biggest problem you'll have is inconsistent friction on the surface. A bit of dust will make a wheel slip by a couple of mm and that means your right angle isn't a right angle any more.

The only way to be sure is to have an absolute orientation sensor (e.g. discrete compass) on board so that your robot knows its orientation. Compasses work reasonably well but you do, of course, have to be careful of large bits of metal and the motors in your servos.

Let us know your solution!

[siempre.aprendiendo]

Well... "to turn in exact 90 degrees"

Always on the same clean and flat surface? I think it's possible but not with a precision as 90.000 degrees, even with an "home oriented" orientation sensor.

On different, but flat, surfaces? Then you need an orientation sensor as Stuart says.