servo motor control??help

[HYETİK]

I want to use servo motor to move measurement sensor.

and I need some ideas to do it...

I want servo turn many times move left or move right...

when I use pulsout command , which values should I send to servo.

I tried it in proteus and when I send 100, it moved 90 degree left and 150 moved center(0 degree) and 200: moved 90degree right???
but I want it turn many times not 90 degree

sorry for my poor english, I hope I can explain my problem

[Charles Linquis]

Aren't most servos limited to less than 360 degree rotation? I think you probably need a stepper motor instead.

[Tobias]

You can buy continuous rotation servos and modify others too.

http://www.parallax.com/Portals/0/Do...csservomod.pdf

Aren't most servos limited to less than 360 degree rotation? I think you probably need a stepper motor instead.

[HYETİK]

is it suitable step motor instead of servos??

[Acetronics2]

is it suitable step motor instead of servos??

for multi turn ... classical servos need to be externally geared and must use multi-turn pot for position feedback.

Steppers seem easier to use, but the problem is for absolute positionning ... not so easy to build the feedback device ... or too expensive.

I'm still looking for a simple way to do that ...

Alain

[HYETİK]

THANKS A lot..
I need accurate turn...

Step and servo, I will try both of them