I have been using a Vex V.5 quite fine for several years. But it has been having some communication issues, lately. So I am considering an Arduino. The assemblage of Vex (and non-Vex) sensors will not be a problem. But the 3-wire motors are a puzzle. I know that Vex 2-wire motors will require a motor shield like any other 2-wire motors. But what about the older 3-wire motors/servos? The white wire is for pwm input.
Thanks
It will depend on the model of three wire motor you have. Before making any connections, check to see what each of the three wires are. One model is like an ESC and takes RC PWM signals. The VEX RC servo motors will need to be treated like normal RC servos - however, be sure to check the input voltage range.
That is a puzzler. They have “MOTOR MODULE” and “SERVO MODULE” printed on them. Is that what you mean by the 2 different kinds? It is understandable to treat them differently.
VEX has released a number of two wire and three wire actuators over the years. You really just need to know what you are holding and what each wire is and the specs.
If you’re not sure, you can upload a photo of them as attachment here.
Motor is in the front, servo in the back. They are identical looking except for the stamped words. The kit was purchased in 2005.
![IMG_7944[1].JPG](http://community.robotshop.com/forum/uploads/default/original/3X/7/c/7c61a02af1fbb1ae36b304740c2a4045f78e590c.jpeg)
That DC has not been in production for some time now, and documentation seems to be lacking. If you can plug it into any port just like a servo, it’s likely controlled the same way - using RC PWM. Try to keep the range from 1.0 to 2.0ms.
Thank you for the information. I have been pondering this thinking in RobotC. It does not seem that RobotC allows a direct change to the pulse, only using the -277/277 range that Vex used. Is that correct? Do I need to use the Arduino language instead of the RobotC?
Regarding the servo and pulses, this should help: youtube.com/watch?v=M7TjTQDQgsU
robotc.net/forums/viewtopic.php?f=53&t=5030
Arduino would allow for the full range.
It sure does. Thank you for your patience.
I watched the video. He sets up the program to do 1 spin, 0 to 255 steps. Then it will stop.
All fixed now. This was a nice selection of info, BOE is close to Arduino. education.rec.ri.cmu.edu/content … ion/4.html
Thank you for your help!