---- START NEW MESSAGE --- Received: from cherry.ease.lsoft.com [209.119.0.109] by dpmail10.doteasy.com with ESMTP (SMTPD32-8.05) id A45A133301B6; Thu, 29 Jan 2004 20:58:02 -0800 Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <19.00CC3F60@cherry.ease.lsoft.com>; Thu, 29 Jan 2004 23:57:51 -0500 Received: from MITVMA.MIT.EDU by MITVMA.MIT.EDU (LISTSERV-TCP/IP release 1.8e) with spool id 9888 for PICLIST@MITVMA.MIT.EDU; Thu, 29 Jan 2004 23:57:45 -0500 Received: from MITVMA (NJE origin SMTP@MITVMA) by MITVMA.MIT.EDU (LMail V1.2d/1.8d) with BSMTP id 5619; Thu, 29 Jan 2004 23:55:56 -0500 Received: from mta205-rme.xtra.co.nz [210.86.15.187] by mitvma.mit.edu (IBM VM SMTP Level 430) via TCP with SMTP ; Thu, 29 Jan 2004 23:55:55 EST X-Comment: mitvma.mit.edu: Mail was sent by mta205-rme.xtra.co.nz Received: from web2-rme.xtra.co.nz ([210.86.15.140]) by mta205-rme.xtra.co.nz with ESMTP id <20040130045547.VUMU5759.mta205-rme.xtra.co.nz@web2-rme.xtra.co.nz> for ; Fri, 30 Jan 2004 17:55:47 +1300 Received: from MARGE ([210.86.79.239]) by web2-rme.xtra.co.nz with ESMTP id <20040130045546.WGAY9867.web2-rme.xtra.co.nz@MARGE> for ; Fri, 30 Jan 2004 17:55:46 +1300 MIME-Version: 1.0 Priority: normal X-mailer: Pegasus Mail for Windows (v4.12a) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body Message-ID: <401A9A93.20071.28A7C0C@localhost> Date: Fri, 30 Jan 2004 17:55:31 +1300 Reply-To: pic microcontroller discussion list Sender: pic microcontroller discussion list From: steve@TLA.CO.NZ Subject: Re: [EE]: Challenge for keen minds To: PICLIST@MITVMA.MIT.EDU In-Reply-To: <001b01c3e6ec$bd319740$0301a8c0@user88l53zxzyb> Precedence: list X-RCPT-TO: Status: U X-UIDL: 371856437 > I have to implement a gate opening detector. > 1) It will be all enclosed in a box with no openings, time of day > programming will be done with an IR remote, data will be collected > from it the same way. Aside from these operations, battery consumption > must be minimum. > > Any ideas to improve this number 1 ? IR is pretty power hungry. Any reason not to use a (gold) contact method for data transfer ? > 2) How to detect gate openings ? RFID - when the gate is closed, the tag is in range and when it's open, it isn't. Steve. ========================================== Steve Baldwin Electronic Product Design TLA Microsystems Ltd Microcontroller Specialists PO Box 15-680, New Lynn http://www.tla.co.nz Auckland, New Zealand ph +64 9 820-2221 email: steve@tla.co.nz fax +64 9 820-1929 ========================================= -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. .