Purists please skip this post as it involves non-LEGO sensors. Lacking an RCX, but loving the motorized cows ( (URL) ), I needed to find a way to control them with the code pilot (from set 8479 Barcode Multi-Set) I have. The only LEGO sensor that (...) (20 years ago, 2-Dec-04, to lugnet.robotics.codepilot, lugnet.trains)
(...) Note that Jason Allemann created a smaller version, more akin to minifig scale: (URL) motor has to be in the base, but other than that it works exactly the same. ROSCO (20 years ago, 3-Dec-04, to lugnet.robotics.codepilot)