ultrasonic sensor. range finder with speaker

so, i want have a ultrasonic sensor with speaker set up.

the goal is the closer the object get to the sensor, the louder the speaker sound.

help pls with circuit setup and code

this is the ultrasonic sensor i have

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_282861_-1

An easier solution would be to have distance related to pitch as opposed to distance related to volume.

However, one way to do it your way would be depending on the distance, rout the signal through one of several pins. ie at 10 feet, pin 1, at 5 feet, pin 2, at 2 feet pin 3 etc. Each of these pins would have a different value resistor, increasing as distance increases.

I'm sure there are other ways but this came to mind quickly.