control acceleration and deceleration for servo motor

troy

i am looking for a relatively inexpensive device to interface w/ a basic stamp controller to control acceleration and deceleration for a servo motor. my goal is to gradually accelerate a rc vehicle and then decelerate and come to a complete stop. any suggestions are greatly appreciated.

thanks in advance

Bean

Troy,
Are you using a continuous rotation servo ? If so you just have to use PULSOUT.
Bean.

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Andy Lindsay (Parallax)

Are you talking about RC throttle control? If so, What's a Microcontroller, Chapter 4, Activity #3 will probably provide you with the correct motion sequence. I would start at the beginning of the chapter, then focus on Activity #3.

If they are continuous rotation servos, there's an example program in Robotics with the Boe-Bot that introduces ramping. Oddly enough, it's a different book, but the same chapter and activity#, Chapter 4, Activity #3.

Both What's a Microcontroller and Robotics with the Boe-Bot can be downloaded from www.parallax.com -> Downloads -> Stamps in Class Tutorials.

There's also a slightly more fancy ramping routine posted·to this forum. It's in the Boe-Bot® Robot Navigation with Accelerometer Incline Sensing post. Look for the Ramping in Navigation heading.