Rick, I think if you pipe that pulse stream into an EMC2 encoder input you can determine the velocity via a derivative function ( also a component in Hal).
Look at the developers manual for HAL and the encoder component and derivative component. I should be easy to setup once you become familiar with Hal. Dave On 8/19/2010 6:31 PM, Rick Calder wrote: > dambacher-retrofit.de<i...@...> writes: > > >> Hi Rick >> >> Do you have a tachogenerator or an resolver? >> >> a tachogenerator is like a dynamo giving a sinus voltage/current wich is >> proportional to the revolutions. You can use a rectifier circuit and measuere >> the effective voltage via a/d >> >> A resolver is tricky, you need to excite it with a sinus signal of a given >> frequency and it gives back two sinus signals the max of the amplitude is >> proportional to the angle position (see wikipedia->resolver). You have to >> convert the signal at the peak of the excite sinus (using a triggering signal >> from the sinus generator circuit), the arctan of the amplitude gives the >> angle. >> you could use commecial circuits but not at that price I think: >> http://www.maccon.de/fileadmin/FTPROOT/2785500.pdf >> >> bye >> Ulf >> >> > > No, neither. I have made a few tachometers using Atmel microcontrollers. The > sensor, either a hall effect or optical, just sends pulses and the > microcontroller counts them up and handles the display. Another one I made > had > counter chips and the microcontroller basically just handled the display part. > > I would like emc2 to do the counting and display. It seems simple enough, I > just haven't found anything in the docs that describes it. > > Worst case, I could just take one of my existing tachs and have the serial > output sent into ttyS00 and then a standalone program would handle the > display, > but can't emc2 handle it ? > > Rick > > > > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
