I built two sensors so far. Both have a two-PCB board design, a ATMega 168 processor, a DCS CO2 sensor, and an array of other parts. The blue verison sends data to my server via SMS text messaging, and the red version sends data via TCP/IP. I built the sensors using Eagle PCB design software, and a local PCB manufacturing plant. Links TBA:

• Bill of Materials (SMS)
• Bill of Materials (TCP/IP)
• Schematic (SMS)
• Schematic (TCP/IP)
• ATMega Code(TCP/IP)

I collect pollution data from the sensors in a MySQL database and then convert 10 minute averages of the data in XML files. An Adobe Flex application reads and visualizes the XML data, and we also have a musical version of the data (by Chris Chafe) streaming online.