View unanswered posts | View active topics It is currently Tue May 21, 2019 2:40 am

Reply to topic  [ 4 posts ] 
countinous Servo Problems 
Author Message

Joined: Thu Dec 09, 2010 12:37 pm
Posts: 1
Post countinous Servo Problems

I have just found out after buying two hitechnic countinous servos that they don't lock their positions. And the problem is that we are using them as a shoulder for an arm. :( So I was wondering if their was anyone how knew how to mod/fix this either by programming :programmer: , or rebuilding.


Thu Dec 09, 2010 12:46 pm
User avatar

Joined: Tue Sep 14, 2010 9:19 pm
Posts: 496
Post Re: countinous Servo Problems
Can you please post your code?

sudo rm -rf /

Fri Dec 10, 2010 3:40 pm
Site Admin
Site Admin

Joined: Mon Jun 08, 2009 4:50 pm
Posts: 70
Post Re: countinous Servo Problems
Hi SuperCell,

Continuous Rotation servos cannot lock their position. They function almost exactly like a mini, geared-down motor. They way they work internally is different from a standard servo and they cannot be stopped to hold a position. I believe they basically remove the servo position feedback capability so that the servo is always seeking. And the number passed adjusts the speed. (Speed could also be adjusted on standard servos--changing the delta speed at which it moved from position to position.)

If your standard servos don't have enough range for your needs, I'm almost certain that HiTechnic makes other standard servos with a larger sweep angle. If not HiTechnic, then other servo manufactures definitely do. Check out some servo / robotics parts sites.

Hope that answered your question and helped get you on the right track,

Bence Feher

Undergraduate Intern - NREC, Robotics Academy
ROBOTC - Testing/Documentation/Developer

Computer Science, Japanese, East Asian Studies
University of Pittsburgh, Konan University 甲南大学

Fri Dec 10, 2010 5:57 pm
User avatar

Joined: Sun Jan 02, 2011 1:57 am
Posts: 31
Post Re: countinous Servo Problems
Having gone through the same realization as you have i recommend using encoders on Tetrix Motors in lieu of continuous rotation servos if you must determine angle. In addition, the Tetrix motors are much more powerful and less prone to burn out, as the servos are commonly known to do. Take it from me I would recommend a Tetrix motor over any servo any time. I had the nightmare of having a burnt out servo on a competition bot at World Championships in Atlanta 2 years ago and having to change it while walking from our pits to the competition field in the Georgia Dome. It was quite an experience and a very good learning experience. I only use servos if they are geared up enough and if i do use them I put in code to prevent them from continuously attempting to reach their position.

You are also not allowed to use any other type of servo in FTC and as such you have to make do with what you have.

Karan Hiremath
FTC Team 110- MFS Foxes
Head Programmer
Service Coordinator

Sat Jan 08, 2011 9:13 pm
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by ST Software for PTF.