Weather board consist of SCP1000 barometric pressure sensor, TEMT6000 ambient light sensor, sensitive SHT15 humidity sensor, directly readable over USB. You can immediately tell what the current pressure, humidity, ambient light level, and temperature is. Graphed over time you can watch weather fronts move in and the rain come down.

Serial output is a single visible ASCII string at 9600bps.

Features:

• Powered over USB or externally
• Absolute barometric pressure accurate within +/-150 Pascal
• Relative humidity accurate within +/-2%
• Temperature accurate within +/-0.3 degrees C
• Ambient light sensor (analog level)
• Serial output 9600bps 8-N-1
• Measurement rate of 1Hz
• Sensors are isolated from all potential heat sources
• Firmware allows for temperature compensation

Documents: 

• USB Weather Datasheet
• USB Weather Schematic
• USB Weather Dimensional
• FTDI USB Drivers
• USB Weather Firmware
• Example Windows .NET application by Mike Williams
• Wiring Example