From owner-freebsd-hardware Sat May 16 20:24:48 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA22756 for freebsd-hardware-outgoing; Sat, 16 May 1998 20:24:48 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from Ilsa.StevesCafe.com (Ilsa.StevesCafe.com [205.168.119.129]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA22670 for ; Sat, 16 May 1998 20:24:28 -0700 (PDT) (envelope-from fbsd@Ilsa.StevesCafe.com) Received: from Ilsa.StevesCafe.com (localhost [127.0.0.1]) by Ilsa.StevesCafe.com (8.8.7/8.8.5) with ESMTP id VAA16282; Sat, 16 May 1998 21:24:24 -0600 (MDT) Message-Id: <199805170324.VAA16282@Ilsa.StevesCafe.com> X-Mailer: exmh version 2.0gamma 1/27/96 From: Steve Passe To: "Matthew N. Dodd" cc: Duncan Barclay , freebsd-hardware@FreeBSD.ORG Subject: Re: interesting stuff In-reply-to: Your message of "Sat, 16 May 1998 11:09:38 EDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 16 May 1998 21:24:23 -0600 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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