Lego Mindstorms Robotics Project: Junction
This is a Lego Mindstorms Robotics project called Junction.
It features Ultrasonic Sensor (far right of the photo) as train detector. When the train is detected the bars are lowered at 90 degrees, bi-tonal sound alarm is emitted by the brick, and Light Sensor is used as a warning light. After a preset time of delay bars are raised back and sound and light stops afterwards. Simple cycle and parallel operations are introduced. (LEGO® MINDSTORMS® Sets used: LEGO MINDSTORMS NXT Education Base Set 9797 and LEGO Education Resource Set 9648.)
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