I designed a sensor interface for a computer if that helps. http://sites.google.com/site/angophoraelectronics/projects/temperature-humidity-sensor Micro-controller ATMEGA8A Humidity sensor HONEYWELL HCH-1000-002 Temperature sensor LM335AZ Crystal 3.6864 MHz Serial interface MAX232 Humidity Sensor Interface 74HC4060 Component cost is about $36 USD.