Couple of options... First, if your buildings have PDU's in them, the newer ones have the abilty (by adding a card usually of course) to do network monitoring. second choice is to use one of the power monitoring chips, such as Analog Devices that use either a current sense resistor or current transformer to get the voltage and current and power readings. Several have SPI interfaces as well. Pretty slick chips, I have one of thier demo boards and it works quite well. From there...just interface to a PIC or (gasp) rabbit that has built in network, and your done..save for some software. >From: Rod Phillips >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: [EE]: Power monitoring >Date: Fri, 30 Aug 2002 03:38:01 -0500 > >Hello to all, > >I would like to monitor power to a complex of buildings. Has anyone had >experience with commercial data logging systems that could be permently >installed in each building and continuously monitor voltage, current and >frequency. I would like enough memory to keep the last 48 hours of >readings, >with say a 1 second sample rate, and be accessable over a lan connection. >If anyone has had any experience along these lines I would appreciate their >input. > > > > Rod > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > _________________________________________________________________ Join the world s largest e-mail service with MSN Hotmail. http://www.hotmail.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads