Servo Control with USB 6009 Hi there,

[Hexley]

 Hi there,

I need to control 8 to 12 servos that work with a PWM signal that should look like this



On labviewforum.de, someone has created this VI that allows to create that signal with a digital output instead of a counter, and that is exactly what I want to do, but the hardware timing doesn't seem to be supported by my USB 6009.

So my question is, is it possible to create such a signal with a USB 6009 at all, and if not, what kind of hardware do I need at least?

Greetings

Hexley

[Jochen]

The USB-6009 doesn't provide hardware timed digital I/O so you won't be able to use this type of device for your application. The cheapest NI-device that provides the requested amount of hardware timed digital lines is the PCI-6224.
Please note that you won't be able to drive your motors directly with this device but you will have to add amplifiers to the digital outputs. Please note also that the approach that you have lined-out will provide only an open loop solution under Windows.
If you need a closed loop solution (with position feedback) please refer to this thread for more information on this topic.

Best regards,

Jochen Klier
National Instruments Germany

[Hexley]

Thanks, that's what I wanted to know. Yes, we use a PCI-6224 at work, so I'm going to try it.

However, meanwhile I've found out that there are third party servo contollers available, that can be controlled via RS232.
As this is only a hobby project, a 27€ servoboard should do the trick.

Greetings

Hexley

Message Edited by Hexley on 04-03-2006 10:46 AM