Re: [WheelWatcher] WW - 02 & SRS Workshop Robot (ARC 1.1 uC Board)

["James Ronald" <jronald@xxxxxxxxxxxxx>]

Pete,

Thanks for the reply.  I just wanted to make sure that I was going to connect the motor wires to the correct locations. 

The SRS Workshop Robot did come with eight .1 uF caps but they were all for the ARC 1.1 board.  No big deal though as I have 10 or so on hand. Also, while searching google, I did locate a good example in the solorbotics sumovore manual regarding how to install the caps.

Thanks again
Jim


  ----- Original Message ----- 
  From: Pete Skeggs 
  To: WW-01/WW-02 WheelWatcher Encoder Support List 
  Sent: Sunday, September 17, 2006 12:56 PM
  Subject: Re: [WheelWatcher] WW - 02 & SRS Workshop Robot (ARC 1.1 uC Board)


  James Ronald wrote:
  > I'm finally getting around to adding the WheelWatcher - 02 encoders to my SRS Workshop Robot.
  Great.
  >   Looking at the instructions it seems that the Encoders are connected to the ARC 1.1 motor ports with the 6 pins cables that are to be made up and that the pins are to be wired straight though (Pin 1 to Pin 1, Pin 2 to Pin 2 and so on).  This seems straight forward enough but the part about wiring the motor connections to SH1 and SH2 seems very awkward.
  Sorry about that.  This was what Larry Barello specified.
  >   SH1 and SH2 are just little plated through holes on the WW-02 board.  It looks like the servo cables used to connect the motors in the level one kit are to big in diameter.  
  Hmm, I'm not sure about that.  I was not involved in the design of the 
  SRS kit, just this encoder.  I personally would go ahead and strip off a 
  little insulation on the existing motor wires and see if they will fit.  
  I find it easier to insert a stranded wire in a hole on a PCB if I tin 
  the wire first with a little solder.
  > Could I use some excess 22/24 AWG from the sensors for this or would this wire be to light.
  >   
  This would probably not be too light, since those motors do not draw a 
  lot of current, and the length of the wire would be fairly short anyway.
  > Also, the WW-02 manual mentions adding decoupling caps.  What values should be used and what type?  Is it important that they be non-polarized for values this small? 
  >   
  The decoupling caps I was referring to should be ceramic or other 
  non-electrolytic, non-polarized capacitors of  about .1uF.

  It looks like the Level 1 kit has such a capacitor, Digikey part number 
  P4924-ND.  Radio Shack has a similar part, #272-135.

  The value is not that important, though -- anything from .01uF to .1uF 
  should work fine.  Solder one between the motor terminals, plus one from 
  each motor terminal to the motor's case.  This effectively eliminates 
  the electrical noise from the motor's brushes.

  -Pete

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