Ultrasonic Rangefinders

A friend of mine hacked a parallel port interface to a few ultrasonic rangefinders. GDAM supports these devices as midi input via a plugin. Thus, we can control aspects of the sound by moving our hands through space. This interface was originally developed for the Texas Instruments Calculator Based Rangefinder:

Pasco scientific equipment offers a compatible model which performs much better:

Once we've reconstructed the hardware a bit, we will most likely post instructions here so that others can try it out. The input.devices line describing a rangefinder looks as follows:

/dev/rangefinder none GdamRangeFinder