While I was sourcing some I2C Chips I came across this I2C ready HH10D Humidity Sensor.Humidity sensor for air-conditioning and monitoring systems. Provides humidity frequency output and digital data values via a 2 wire SPI interface. No external components are required, the unit can be connected directly to a microcontroller.
Features
• Small Compact Size
• Humidity Range: 1 - 99% RH
• Resolution: 0.05 %RH
• Accuracy: 3 %RH
• Ideal for air-conditioning and home monitoring systems
• Dimensions: 24mm Length, 8mm Width, 2.5mm ThicknessIt's available from Futurlec,
http://www.futurlec.com for $9.90.