Pneumatic Valve
This valve is based heavily on Linc's Pneumatic Switch. It has been modified to remove some friction on the worm gear, and to hold the 24t gear a little more firmly. Most importantly, it adds a touch sensor at the center of the valve arm's throw, so that the controlling program can keep track of its position. The resulting structure is about one stud thicker than Linc's design.
More photos of the valve:
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Building instructions
Building instructions for the valve are available here as a series of 15 images in three parts.Source code:
Copyright © 1999 Ben Williamson