On Wednesday 06 April 2005 10:52 am, Ren und Stimpy wrote: > Hi again, > > 1-wire research is going on ;) > > Unfortunately Dallas refused to send me a USB / 1-wire adapter, so I > will have to build one myself. > > I would go with the DS2480B as you said, there are several different 12V > RS232 to 1-wire Adapters explained in the Datasheet, I assume they all > work fine with owfs but would you reconmend one of them ? > I guess you don't want to buy the DS9097U or LINK? If not, I'd use the example circuit from the Dallas datasheets. If you want to build one of the example circuits, look at the provenance. The one I designed is probably terrible, and I've never gotten it to work. David Lissiuk makes very nice and functional designs, and there are others on the web.
Between the USB and serial, it's a toss-up. OWFS doesn't care. > Or is the DS2490 the better solution? The Adapter shematics seems pretty > simple. > Soldering surface mount devices isnt that hard, i've done it serveral > times now, needs patience and thin wires and trains the steady hand ;) > > I first wrote you because I want to use the 1-wire bus to control a > stepper too but didnt explain it really so here i go: > > The plan is, between measurings I want a DS2408 to control a small 12V > printer stepper. > I want to connect 4 I/O Pins of the DS2408 to a ULN2003A stepper driver > chip. > All parts were ripped out of an old printer and this setup works fine > connect to the parallel portSo I wonder how fast the DS2408 will change > between the 4 needed I/O constellations because this will have heavy > effect on the maximun turning speed of the stepper. > OWFS uses a "block device" model, so it doesn't accept a stream of data except as functionally separate transactions. This mean that controlling the DS2408 would be a separate write for each step -- I haven't timed it but probably around 10Hz. We could improve this if you wish -- add a new property that takes 16 steps at a time, for instance. At least you can send all 4 control pins simultaneously. What rate were you looking for? > Best regards and thanks again for programming owfs > Simon > > P.S.: Bought some optokopllers and did some experiment to get familiar > with this (to me) unknown part... All 3 went up in smoke but thats ok, > found the failure (i hope) and will continue experimenting with > optokopplers and LEDs That's my style of hardware testing! ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
