CCS Robotics - Servo Calibration ?

[fos]

Please reference Chapter 6 Basic Movement in the exercise manual that accompanies the Robotic Development Kit - manual version - April 2009

See paragraph below gray source code box:

Quote: Compile the program and download it to the controller board by clicking Tools > ICD.
Once the program is running, the Servos should start to spin. --> Using your fingers, turn the potentiometer until the motors stop spinning. Reassemble the Servos. <--

The program runs properly. The servo motors spin. Where is the potentiometer? It is not on the controller board. As the line above implied, I disassembled the servo motor. When I examined the wiring/control side, no potentiometer is apparent. Is this line a typo? What should I do here?

Thank you,
Jeff Greer

PS. Is there a way to zero the servo motor motion via servo.c ?

[PCM programmer]

Most of us don't have the manuals. CCS used to post the manuals
here, on this webpage:
http://www.ccsinfo.com/pdfs/
Then they pulled all the manuals off, about a month ago.
The only things left on there are Table of Contents and brochures.

Why don't you email CCS support and ask them why they did that ?

[fos]

I found this info on the junan.com site after a lot of digging...

Using a razor or coping saw, cut a 1mm groove in the end of the potentiometer shaft. This will be used as screwdriver slot when the servos are calibrated.

See the manual at the Junan site:

http://www.junun.org/MarkIII/Manual/Appendix.jsp#Servos

The potentiometer shaft is accessed through the output shaft of the servo. I'm not sure it is worth that much trouble. I purchased this thing as a learning platform. The mobility function is minor when you consider the sensors.

Thanks, Jeff

[fos]

If anyone else is having the same problem with their CCS Robotics Development kit, http://www.junun.org sells the pre-modified servos for $16 each.

Jeff

PS. I did contact CCS support via email. So far, no reply.