On Mon, Sep 12, 2016 at 8:25 PM, Gene Heskett <[email protected]> wrote:
> On Monday 12 September 2016 23:08:53 Gregg Eshelman wrote: > > > Why not use twisted pair ethernet cable? > > > Because its single strand solid and supposedly fragile? The ribbon is 7 > strand & able to stand more flexing. > There are two kinds of Ethernet cable. (1) patch cords, there are flexible with stranded wires inside and molded over RJ45 connectors on each end. and (2) the kind that comes in 500 coils in a box and goes inside walls. The stuff is sold core. For data cables you would only use the flexible patch cords That said for short run of a single ended signal they work fine. I would go with the twisted pairs as are found in Ethernet cable for differential signals. After all Ethernet uses a fast baseband differential signal Gear teeth sensing does not require a high performance solution the pulse rate is slow, a couple KHz at most and the signal is very strong compared to any noise that might be present. > And I found, at Wallies of all places tonight, some glue pens that > dispense uv setting resin with an included uv light to cure the stuff. > > I intend to make some use of that to prevent wandering wires from > wandering while they are inside the headstock. > > > > > > From: Gene Heskett <[email protected]> > > To: [email protected] > > Sent: Monday, September 12, 2016 11:43 AM > > Subject: [Emc-users] output sink of the 667 hall effect? > > > > Greetings all; > > > > I see by the spec sheet that the allegro 667 gear sensor can sink up > > to 25 mills. > > > > But with 3 such sensors on the end of a long cable back to the > > breakout board, probably 7 foot by the time I get it routed, I am > > concerned with the potential for crosstalk noise in spite of putting a > > bypass capacitor on the encoder itself. > > > > This noise would be reduced by a lesser amount of current. So, for > > those of you using this device, what value is the resistor are you > > using for a pullup at the breakout board? > > > > And if using a piece of idc ribbon cable, it seems to make sense to > > put a grounded wire between each of the A|Z|B conductors, making that > > a 7 conductor cable rather than a 5. I have around 90 feet of 26 wire > > ribbon I can split off what I need from. > > > > Good idea? Or off the wall & probably will be plagued by noise if I > > shoot for a 10 milliamp pullup with a 470 ohm pullup, or even 5 mills > > with a 1k pullup. > > > > Time to assemble that motor driver box I believe. > > > > > > ---------------------------------------------------------------------- > >-------- _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > 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 > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
