> >> On 01/26/2020 08:04 PM, John Dammeyer wrote: > >>> I set my BBB aside when the Xylotex cape I had forced normally open > limit > >> switches. > >> The limit switch polarity can be set in software. In the > >> configs file directory, in file > >> CRAMPS.hal there is this : > > Unfortunately not. The signal was wired in hardware so the enable on the > level translation devices was shut off when the switch was closed to ground. > So a NO switch would close signalling not only a limit condition but also > shutting off all the drivers. > > > > A NC switch would never allow step pulses out. > >. > Well, clearly this is a design defect in the breakout board, > NOT a problem with LinuxCNC/Machinekit. > Also makes homing kind of funny. > > > Jon > Which is why I went to BC Asset Recovery (Provincial Government Surplus) and bought two PCs for $75 each. At that point it wasn't worth mucking around. And to be fair, although Xylotex wondered why I cared about NC or NO switches, the cape I have was discontinued and they now have one that is strictly I/O and probably way more suitable for MachineKit. Available for $25 however their online ordering only supports US sales and I suspect shipping will cost more than the board. Too bad it's not available through Amazon Prime. Then I'd get it in a couple of days with free shipping. Ah well...
http://xylotex.netfirms.com/OSCommerce/catalog/index.php?cPath=33&osCsid=399f6b4f8d069f3ae3d3569d71d7839c And note, although it's still in the works, they are working on an FPGA board with 72 I/O John Dammeyer _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
