 | | Re: Lego Mindstorms Controlled Train Crossing (Duel Track)
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| (...) similar, but used 4 light sensors, 2 in parallel like this: Crossing -> | | ===...=== <- Track X1 X2| |X3 X4 X2 & X3 are in parallel, when X1 is broken, boom goes down & stays down while either X1, X2 or X3 is broken. Similarly for X4. This (...) (23 years ago, 15-Jun-01, to lugnet.robotics, lugnet.trains)
| | | | | Re: Lego Mindstorms Controlled Train Crossing (Duel Track)
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| (...) I'm a programmer - and I have an evil mind... The train driver spots a JarJar Binks minifig standing at the crossing and with murderous intent he trundles swiftly past X1, X2 and X3 - and then stops...just far enough along to block X4 - but (...) (23 years ago, 15-Jun-01, to lugnet.robotics)
| | | | | Re: Lego Mindstorms Controlled Train Crossing (Duel Track)
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| (...) That's what mine does. If any sensor is broken it starts a timer. If no sensors are broken after the timer expires they go up. This worked very well except for very short trains. Hence the plans for a third sensor right near the track to take (...) (23 years ago, 15-Jun-01, to lugnet.robotics)
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