I expanded the RCX outputs from 3 to 12 (6 sets of 2)using 2 rotary switches and one feedback POT (50k ohm). The 3rd RCX output is used to to energize a motor that rotates both rotary switches and the pot simultaneously( they are mechanically liked (...) (24 years ago, 31-Oct-00, to lugnet.robotics)
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