[Al Skierkiewicz]

Der,
From a quick look at the description page, it appears that one pin on the module is a trigger and the other is the output from the sensor. You will need to write code to initiate a pulse and measure the time it takes for a return echo on the output pin. You then have to perform a calculation to determine distance based on the acoustic transit time at whatever altitude and humidity the sensor is being used in. To interface, you would use a digital output to trigger the output pulse and a digital input to listen for the echo. The description says it is TTL compatible.