Jonathan Hancock wrote: > Hi all - just a quick update on my Puma project. > > As a thought, the output from the original encoders is a sin/cos > waveform (to see goto http://www.flickr.com/photos/[EMAIL PROTECTED]/ ). I > will try to convert this low level signal into a ttl level square wave > using an op-amp. The encoder has a pair of leds and photo sensors in. > OK, looking at the very asymmetric waveforms, I'm guessing these are just raw photosensor outputs, and not real sine/cosine signals ready to be interpolated. I can't tell the voltage levels from the pic, but a simple comparator circuit should be able to convert to TTL levels.
Don't use an op-amp, they are too slow and don't have a "digital" output stage. Use a comparator such as the LM193. > I am looking at using a pic adc to gain limit and homing signals from > the pots on the back of the motors. This is looking quite promissing. > > I've installed ubuntu and emc2 on my machine and now baffled! > > Jon - am I sorting the correct things out to interface to your cards? I guess so. You would need digital A, B and Z signals, and a contact closure or opto-isolator output for the limit signals, and home switch simulation. Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
