Date: Sat, 16 May 1998 21:24:23 -0600 From: Steve Passe <smp@csn.net> To: "Matthew N. Dodd" <winter@jurai.net> Cc: Duncan Barclay <dmlb@ragnet.demon.co.uk>, freebsd-hardware@FreeBSD.ORG Subject: Re: interesting stuff Message-ID: <199805170324.VAA16282@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Sat, 16 May 1998 11:09:38 EDT." <Pine.BSF.3.96.980516110452.17033x-100000@sasami.jurai.net>
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Hi, > > One "problem" with the I2C is that it is not a TTL compatible bus, so a > > bit of hardware is need to convert the logic levels. > > > > Secondly, the framing on the I2C bus doesn't lend itself well to UART > > style parity/start/stop bits. > > One problem with the parallel port is that it won't be sufficient for > remote sites that want temperature monitoring hardware hanging off a > serial port. > > I think any less than simple design (I can get a $99 I2C to RS-232 dongle > from a number of different places.) implies multiple I2C busses, a small > PIC or processor and other stuff. > ... check out: http://www.freebsd.org/~fsmp/HomeAuto/Therm.html -- Steve Passe | powered by smp@csn.net | Symmetric MultiProcessor FreeBSD To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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