John Pfleger wrote: > I am adding a plastic extruder to me EMC2 controlled desktop mill (with MESA > 7i43 card) and am looking for the best way to control the stepper motor for > the filament feed. > The existing examples (Sam Wong) uses the controller board from the RepRap > project (version 1) so is not suitable for my needs. The temperature of the > extruder will be controlled via a MSP430 micro and a PID loop, with EMC2 > setting/reading it via the serial port, this is just a port of the work from > Jeff Epler (http://axis.unpy.net/01198594294). > > So far I have thought of three different ways to do this and am looking for > advice/best practice on the path to follow. > > 1) Use the MSP430 to generate the step pulses and set speed via serial. This > is similar to the Sam Wong version. > > 2) Generate a square wave using a HAL component > > 3) Use a PWM generator in the 7i43 card and vary the frequency to adjust the > speed, > > I think the preferred option is to use the 7i43 to generate the pulses but > not sure what the best way to do this would be. Could I use one of the > existing STEPGEN modules (how?), do I need to program the PGA to make a > special continuous STEPGEN (no experience in doing that) or is PWM the > easiest way?
For controlling an additional stepper, enable one more hm2 stepgen on the 7i43 by incrementing the num_stepgens number in your config string, then connect the proper 7i43 pins to the extruder stepper amp. If your config is based on the hm2-stepper config, the config string is near the top of the .ini file. The pins to use are shown in the dmesg when you load the new config. -- Sebastian Kuzminsky an it harm none, do what you will -- Christopher Bingham ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
