AVR-Chat

At 07:12 PM 6/19/2004 +0000, Phil wrote:

>Servos can be modified to make them rotate 360.  I've done it for a 
>number of GWS servos.  If the FS3003 uses plastic gears (and I think 
>it does) then its pretty easy.  you will have to remove the "nub" 
>that prevents rotation and disconnect the feed-back pot. google for 
>servo modification - there are numerous pages on this topic.

Modified, yes. Stock, no.

>PWM control of the servo typically is a 1-2 mS pulse within a 10 mS 
>window.  A 1.5 mS pulse is neutral (no rotation), a 1.0 mS pulse is 
>full speed one direction and 2.0 mS is full the other.  Proportional 
>values for proportional speeds (i.e. 1.75 mS is half speed, approx).

The ones I've seen, have been 500 - 1500uS
I did see enough variability that I added the ability to set min and max pulse width per servo, and the firmware then calculates pulse widths for an 8 bit zero to full scale motion per servo.

The sync gap can be shortened, to get more torque, up to a point.