On Monday 13 February 2017 11:35:18 Jon Elson wrote: > M. P. Jones has some 80 mm manual encoders for $19.95. 100 > pulse/rev, differential output, they don't say anything > about detents, but hopefully it has them. Part # is 33106MI > > Jon
I saw that Jon, and eagerly await a user report. I could have visions of something like a pair of them on the new apron on my Sheldon. I think itr would require a 3rd cable across the saddle unless some sort of hookup to the wireless keyboard and mouse could be worked out. They also have some 2.4Ghz kits that might be able to talk directly to the radio in the r-pi 3b. Andy I believe has a similar 2 dial setup on his Holbrook? We are I believe missing out on the use of the radio's in some of our driver setups to get rid of 200 feet of cable for this and that, simplifying the cabling down to a power supply for this and that. Best bet for the com would be the $3.95 a copy 315MHz radio pairs. Encode the transmissions with an x10 house code you are not using with heyu in one nibble, and the state of the "housecode" in the other nibble. This has a range from 20-200 meters and should be able to ignore most of our manmade noises from switching power supplies etc as 95% of that is below 200 MHz. One receiver feeding a shift register at a 2MHz update rate, should be fast enough for a transmitter module to decoded lag between a limit switch closure, to linuxcnc seeing it at the rx decoder of perhaps 10 microseconds. That would allow us to track 15 limit switches, or 10 toolchanger status bits. All this by setting up a housecode for each category of control status. The actual protocol we'd need to define if for no other reason but a std, so a board could be built and used by all. X-10/heyu is as good as any provided it doesn't clash with your other X-10 stuff. I doubt there would be crosstalk between them since X-10 is a very slow data rate system. Its a 120 baud system, whereas we could use as high as 2 megabaud. This, if these good looking controller dials have a center off detent, would lead to some very nice hand controls as we could monitor the counts either side of the center off. Then we could set the speed of the motion by starting very slow, and multiplying the speed by 1.5 of what it currently is for each step farther from center. I like the concept. One 74ls138, half of which decodes the housecode nibble, and its output becomes the CS for more 74ls138's, each of which then outputs that housecodes 4 bit nibble. 1970's tech, it just works. Incorporate a timer to disable some of the output bits after 50 milliseconds of the transmitter being in the off state. Obviously I like to play what if. :) And I have 6 dials, badly worn, from some Panasonic video tape editors no longer in use since everything is on hard drives today, that I've considered hooking up, possibly replacing some centering springs. These are dual dials, a centered off outer dial that selects the speed and direction of the tape movement, and a center dial with a finger depression that allowed us to spin the dial to move the tape, in the direction we spun that dial, on a frame by frame basis. The problem with them was the rubber rims on the outer dial, hand lotion dissolved them in a week, natural finger oils in 6 months. Sticky crap thats very difficult to remove from your fingers. They are about the same size, but the encoders are mechanical switches, rubbing contacts IOW, and much coarser resolution than these MPJ dials are. And they weren't designed for 100 million revolution life. Plain bearings IOW. I may dig one out this evening after I get back from visiting the wife, and see if I can decode how it works. 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
