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Would this solve your problem? Depending on the direction of the input, only one axle will turn.


Maybe you should look into using a multiplexer to add additional sensors to an NXT brick. The Hitechnic Sensor Multiplexer lets you connect 4 sensors using only 1 of the NXT connection. The same thing can be done with motors. For example using the Mindsensors NXTMMX, you can add 2 additional motors per multiplexer (even better, if you daisy-chain the ...

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