At first sight, "VHDL code" and "stim sensor interface" are completely unrelated terms. I think you should explain in detail what you want to achieve.
Presuming your post is about an academic project assignment, I would suggest that you review existing literature, write down a project concept and come back with more specific questions. The purpose of the project is that you are learning how to handle a design job and the detail engineering.
My project concept is connecting different sensor with cpld (c2c256 TQ144) chip and transferring the sensor data to network by using zigbee module and USB serial port.
My project concept is connecting different sensor with cpld (c2c256 TQ144) chip and transferring the sensor data to network by using zigbee module and USB serial port.