These are plans and thoughts on building a PC-based weather station. First off all, let's describe the parts. 1/ PC A PC acting as a server, mostly file and webb. It's always on and makes a good data collector, runs Ubuntu Server. In service. 20080209 - This one shall be replaced by a NSLU2. 2/ DS9490R USB--1-wire adapter. This is connected to the server. In service. 3/ 1-wire network. In this network we have some DS2405's that switch on electronic relay's that's connected to lamps an led's. We also have two DS2450 4-way A/D. In service. -------------- $dev[1] = "/mnt/owfs/05.DC4F21000000/PIO"; -- led spots $dev[2] = "/mnt/owfs/05.231F14000000/PIO"; -- Wall lamps currently not working $dev[3] = "/mnt/owfs/12.6F7125000000/PIO.B"; -- window -------------- 4/ MPXA4115A pressure detector. (PDF) To measure air pressure. In service. 5/ LDR Mounted in the window with a LDR looking out, this makes it possible to check the light level outside. In service. 6/ DS1821 temperature sensor Mounted outside. Might be replaced by the SHT11. 6/ Tellstick Not really for weather but anyways... a USB connected device that controls radio activated switches. Used with the lightdetector to switch light on automatically. In service. Future plans: 1/ SHT11 Humidity sensor This one communicates with a I2C-like interface and measures humidity and temperature. Will be connected to a USB-PIC (PIC4550?) and connected directly to the server. A 1-wire sensor had been great but they're not cheap... Info 2/ PIC16F690. Attached to the 1-wire net this Pic will act as a data collector. 2/ PIC4550 Connected to the server to collect data. Will use Microchip CDC (serial port) code. http://jorgev2.com/category/linux/ - using PHP with serial port. Dio - PHP extension for serial port access.