Greetings Mr. O'Reilly The 22ns you refer to is switching time of the output chip. What would be meaningful is response time from an input to the port and the corresponding output after processing time.
Of course all of it will be very quick compared to the response time of a heater. I think what is being neglected in this discussion is emphasis on the ability to measure several things and graph them and store the records for later use. Transducers are a fascinating study and the heart of interfacing digital computers to the physical world. Don't forget backup failsafes. Any accidents in this fledgling enterprise will be blown all out of proportion to the public. Home processing could be banned for example. The people that own petroleum don't want competition. Kirk --- Paddy O'Reilly <[EMAIL PROTECTED]> wrote: > Hi, > > I've been thinking about using old PCs to do exactly > this job for ages > and for work I've used LabWindows to drive the > parallel port for a host > of stuff. I've been looking at using plain old > DOS6.22 and freeware > TurboC for control. Most parallel ports are > bi-directional (well on any > PC that still works), TurboC can be quite compact > and when you run it > under DOS there are no crazy Windows traps to fall > into. I tested the PC > port of an old 90MHz Pentium and I think I got 22ns > switching rates from it. > > However, I haven't managed to get the time or useful > purpose for any of > my ideas yet but I'd be delighted to give you as > much info as I have on > controlling parallel ports and my limited knowledge > of Turbo C. > > Paddy. . __________________________________ Do you Yahoo!? Yahoo! Mail - Find what you need with new enhanced search. http://info.mail.yahoo.com/mail_250 _______________________________________________ Biofuel mailing list [EMAIL PROTECTED] http://wwia.org/mailman/listinfo.cgi/biofuel Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuel archives at Infoarchive.net (searchable): http://infoarchive.net/sgroup/biofuel/