Re: [WheelWatcher] WW-01 Code

["Jim Ronald" <jronald@xxxxxxxxxxxxx>]

Parallax servos do have an adjustment potentiometer.


----- Original Message ----- 
From: "peters" <peters@xxxxxxxxxxxxxxxx>
To: "WW-01/WW-02 WheelWatcher Encoder Support List" 
<wheelwatcher@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, April 15, 2009 4:47 PM
Subject: Re: [WheelWatcher] WW-01 Code


> Curt,
>
> I hooked a PIC 16F877 board (a Junun MarkIII board) back up, and tried my 
> example program using Parallax servos.  It exhibited some behavior that 
> sounds similar to what you see.  Other than small errors in zeroing the 
> servos, they do spin when requested by the various tests.
>
> This behavior is that a wheel spins when it is not supposed to.  This is 
> because the servo is not properly adjusted, so the 1.5ms neutral pulse 
> width causes it to spin slowly.  Since the Parallax servos do not have an 
> adjustment potentiometer, my example program would need to change to allow 
> you to set the neutral pulse width of each wheel separately.  It would 
> also need to add a way for you to interactively find the correct neutral 
> pulse width.
>
> I may add these features to it.  Meanwhile, have you had any progress?
>
> -Pete
>
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