Servo motor

Hi.
How to create servo motor? Like those in RC toys.

I guess I could use hidge joint and add script to it to reinforce moving to right angle?

Any ideas?

THX

 

No one

 

You already have the basic idea. You can use the HingeJoint motor and limit features to simulate servo control. Setting an angle can be as simple as turning the motor "on" by setting the HingeJoint.motor.targetVelocity to a positive or negative value, then reading the HingeJoint.angle until the desired angle is reached, and then turning the motor "off" by setting HingeJoint.motor.targetVelocity to zero. You can obviously get more sophisticated if you need realistic servo behavior.

 

Hi, Brian!
Hope you'll read this message.
I am also trying to create servo in unity, and I've tried a number of approach already, each having it's own flaws. When you set HingeJoint.motor.targetVelocity to zero, it doesn't stay at the point you've reached, it slowly goes to lowest energy position (look at video in the link, the left model).

https://drive.google.com/file/d/0B4-yUbCiwsheemphRXVlTHI4Qmc/view?usp=sharing

In the right model I am using configurable joint (with drive mode position), but it seems to act like a spring too much and I am now trying to come up with idea how to fix it, if it's possible.

Also accuraccy is terrible - it's around +/- 3 degrees ):

 

I've got a servo controller that I wrote that I might dig out and donate to the Unity community. It's in C#. It works pretty good, decelerates nicely and doesn't overshoot the target, accuracy is good. It's a position controller, not a velocity controller. Let me know if you need it...

 

I got a request so here's a link to the basic components: http://www.technologicalutopia.com/servo.htm

 

Many thanks Wowo51!