Here is a video with me successfully getting the ultrasonic rangefinder to function. From here, I detached the piezo and instead switched it out with a DC motor. At this point, I was at a standstill.
I needed the ultrasonic rangefinder to trigger a DC motor, which needs 9v of power to spin. However, the arduino crashes when you feed more than 5v of power to it. The DC motor that requires 5v of power is too weak to move my parts. I was in the studio most of yesterday moving wires around to get something to work.
Also I nabbed the last 9v battery and it just died on me.
I'm trying.
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