Altera MAXSONAR LVEZ1 sensor

Hi,

sorry for causing irritations... The ALTERA FPGA may be operated e.g. with 2.5V or 3.3V I/O supply - thus you have to ensure that the sensor and the FPGA use identical voltages.

With this in mind, you should be fine with connection Supply, GND and TxD from Sensor to RxD of DE2.

For the sensor sending data w/o being interrogated (otherwise you would have to implement "Send" as well on the FPGA), I assume the best is instantiation of a module continuously receiving and converting the datastream generated by the sensor and providing the result via the module's interface to the rest of your code. As I'm not familar with Verilog - this is like I would solve this in VHDL...