Using Firmata4j with Grove Beginner Kit to make Ultrasonic Radar

[vikaspsgupta]

I am working on an assignment to create ultrasonic radar but facing issue, while using the Grove Ultrasonic sensor. I have connected the Ultrasonc sensor to D7 I/O port. But facing issue on how to use it, basically the sensor has to work as transmitter and receiver both, so it should work as input and output too. But i am not able to get how i can use the Firmata4J to transmt the pulse and then receive it. Can someone help on it? If its a limitation, any clue how to get rid of it?