A simple RC filter possibly combined with voltage division will remove noise although it will also reduce accuracy.
I think low input impedance will fix the problem with noise because even though voltage may be high only a limited amount of current may be transferred by capacitive coupling or an electric field. Nicklas Karlsson Micropower On Thu, 30 Jul 2015 08:02:45 +0100 Marcus Bowman <[email protected]> wrote: > > On 30 Jul 2015, at 03:51, Gene Heskett wrote: > > > I bought a bag of small, roller tipped microswitches, and have a couple > > mounts laid out but not carved yet. > > > > Going thru searches on ebay just now, for both inductive, capacitative, > > and IR proximity switches, It sees like the majority of them are needing > > 6 volts or more, and around 300 ma each to function. Having seen some > > micropower capacitative switches in the textbooks of yore, it seems like > > the ball has been dropped in terms of being useful in a 5 volt logic > > circuit. > > > > Both the microswitch, and the inductive versions would seem to be > > sensitive to collecting swarf, particularly if its a rare earth magnet > > running a reed switch. > > > > My lathe seems to be relatively happy with a microswitch located under > > the back edge of the bed for Z homing where swarf tends to fall on past > > it, but x has to be kept swept clean because its actually on top of the > > carriage. > > > > I see a whole passel of stuff drilled onto GO704's in the hits I can get > > from google, but all of them preclude retaining the rubber swarf > > shields, which I'd say was not worth the tradeoff. There has to be a > > better way. > > > > So what sort of switches, and what swarf shielding to keep them > > relatively clean & accurate are others using? > > > > PM's with pix appreciated if you have the time. > > > > Actually, this is a really interesting question. Having spent ages thinking > about shielded locations for the mill, and about to do the same for the > lathe, it would be useful if folks could put the pictures somewhere we could > all see them. > If anyone has any recommendations about makes and models of switches/sensors > which provide better accuracy and repeatability than others, or useful ways > of providing adjustment on mounting arrangements, that would also be very > useful. > > Marcus > > > Thanks. > > > > 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 > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
