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TechnicBrickPower posted a topic in LEGO Technic, Mindstorms, Model Team and Scale ModelingHere I present a programmable controller to control two independent functions simultaneously. The controller uses two tank tracks with pins on them to select between neutral, forward and reverse to control a small crane. The timing of the switching can be controlled by the placement of the pins on each track in effect allowing you to program the timing sequence. The example crane can follow any sequence such as hook up, rotate clockwise, hook down, hook up, rotate anti-clockwise etc. The tracks have 40 segments each to allow up to 40 different timing options, however these can be extended as required.