The trend in the automotive industry is to exchange most of existing mechanical parts for electric or electronic parts in vehicle. The number of sensors are increased and the needs of customer are getting more complex. So most of hard parts to support driving condition should be changed to intelligent parts, like ASIC, MCU etc, to satisfy customer’s complex needs. We have two special concepts in this project to accomplish those goals. The first one is achieve the ability to develop rain sensor, the second one is to optimize and integrate several function, hardware parts to reduce the cost and package size.