 | | Re: "cat whisker" trip switch —Jim Rorstrom
| | | | (...) ower Steve, Steve, I poked around on the Web a little regarding model railroad sensors. Infrared sensors are generally placed between the rails facing up. They emit a constant infrared beam which is reflected back to the sensor when a train (...) (25 years ago, 18-Oct-99, to lugnet.trains)
| | | | | | | | | | Re: "cat whisker" trip switch —Jim Rorstrom
| | | | | (...) To follow up on my laser comment (above). Josh Yeager in post #7294 (Robotics) offers his own laser module for Mindstorms. He is asking $35. - Jim --- (25 years ago, 18-Oct-99, to lugnet.trains)
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