Modding a Servo

If this: http://www.servocity.com/html/hs-311_standard.html is my servo to what position should I have my picaxe turn it to so I can make it continuously rotate?

 

nope
That servo is not continous rotation --it is a standard one.

I should add…

I should add that there is no reason that servo could not be modified (physically) to make it a continous rotation. There are a million tutorials out there --just google it or search here.

Oh yeah, I mean that I am

Oh yeah, I mean that I am modding it and I was wondering what angle I should have it go to via the microcontroller,

ok
What positions have you tried so far?

I scrapped the servos from

I scrapped the servos from an old project, a photovore that could only move forward. So it was modded to stop rotating when sent the command degree 0, which I’m pretty sure that if it stops at 0 then there’s no way to go backwards but IDK.

The modification

Could you describe what you did with the wires going to the pot inside the servo? Did you glue it in the center position? Did you disconnect it and add a resistor bridge? Did you remove it?

Just lemme know and I can give you a better answer.

I disconected the pot from

I disconected the pot from the gear assembly.

There is your problem

You could send this servo any command at any position and you will always get the same result without a pot or resistor bridge installed. My suggestion is to find a modification tutorial --there are a ton out there and note how others have dealt with the “pot issue”. I would assume the circuit board is still in place --If it is not, you still have a good geared motor there, you would just need to add a motor driver to it, like a L293D.

I mean that the pot is still

I mean that the pot is still electrically connected however physically it is not (we modified a gear so that it no longer came into contact with the pot). I think you misunderstood.

In that case…

It should be a matter of simply “centering” the pot and then playing with the servo positions within the code. When you find the “centered” number in the code, the number that stops the servo from moving, you got it! From there, numbers greater than “center” should make it go one way, numbers less should make it reverse. In theory, as the position numbers get farther away from center, the servo should go faster in that direction. --When you get everything the way you like it, most people glue the pot in that positon.

So a pot centered at 0

So a pot centered at 0 wouldn’t be very useful?

Ummm

If the pot is at “0” I would have to say it is not “centered”…

I would probably go, say, 1/2 way from one end and 1/2 way from the other end (or so).

Oh yeah–

A good way to center the pot perfectly would be to use a multimeter.

Thanks alot for the help!

Thanks alot for the help!

I have this servo and have

I have this servo and have modified one for continuous rotation. 150 is the center point I used in AVR Studio when I did the modification.

The info I used can be found here: http://societyofrobots.com/actuators_modifyservo.shtml