As usual, I apologize in advance for posting hardware issues on the software/drivers mailing list, but I'm out of ideas. I have a DS2760 and I'm trying to use the I/O pin to drive a load. I have a 1k pullup resistor to +5V, to pull the I/O pin high, and the node attaches to the gate of a pmos fet that drives a relay.
When I bring up the power and mount the owfs file system, the pin is stuck at 0V -- it comes up driven to ground. Then I 'echo 0 > PIO' (or use the owhttpd webpage -- both *marvellous* pieces of software, mind you, and a continuing wonder to me and my friends who are doing similar stuff) and the pin goes high, to +5V, which is a little confusing -- I wouldn't expect it to do anything. And then it does nothing at all, no matter what I do with defaultswen or defaultpmod or PIO, until I reset the 2760 by unpowering it and repowering it, at which point it does exactly the same thing. So it looks like it's working -- it sees my command, it does what I say, but only once. What I'm looking for is something I can plug in to the computer and drive a relay based on thermocouple output -- an oven controller. If I *have* to use a 2405, I can, but I'd really rather just use the one chip. (and Dallas no longer produces the 2405 or 2408? What's up with that? Harumph!) The point being: I would like to get this working without having to go in and edit the EEPROM and then cycle power, because I'm not really going to be able to cycle power on a complete project that's off in a running kiln somewhere. I wrote in about this a year ago and got some great suggestions, including the discussion at: http://www.weathertoys.net/phpBB2/viewtopic.php?t=70 but the reason I'm confused is that the 2760 is working just fine: reads temp, thermocouple, everything else just like it should, and controls the PIO once, but only once. Anyway, thanks for any suggestions. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
