On Thursday 29 September 2016 07:50:23 Sarah Armstrong wrote: > i'm looking at a renishaw MP10 IR probe > iv'e posted some snipps of what i am , ( or better think i am ) > getting as an output > > https://www.dropbox.com/sh/kwjxef6k4ptbhhb/AABdCLSjzypH574XoXJv_it3a?d >l=0 > > it looks to me all it's doing is giving a constant mark space ratio , > and stopping on a probe hit , surely it cant be that simple , or > could it i must admit at this point , i have not dug anydeeper as yet > , or really looked to see if i can find any data , but it's very > obvious everything stops on a hit > > i was expecting some data or id and say battery condition , but just > early days > found i had a better signal using a 1838 ir that a qse159 but i may > need some better signal conditioning at the moment > What I can see in the scope shots looks pretty clean. All you'd need is to run it thru a comparator to make a rail to rail digital signal out of that if its not already.
If there was a timebase setting visible in the scope shots, I missed it. That would determine how fast you should be moving to achieve the accuracy needed. Detection of the hit should probably be done with a re-triggerable one shot (the cmos 7555 comes to mind, batteries last till the rapture) whose timeout period is set for about 5% longer than the period between pulses, so the one shot would time out quickly after the first missing pulse, using that as the hit indicator. I would, on the off chance it puts out a last pulse at the hit point, probably longer, independent of the pulse train timing which might only be used as a keep alive. So the scope trace should be looked at very carefully at the point where it stops, with an eye toward detecting only that unique pulse as the hit pulse. But I suspect you knew that already. :) [...] Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
