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Using the Light Sensor A LEGO light sensor utilizes a LED and a phototransistor to read the reflection of light off a surface. Light sensors are useful. - ppt download
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![Lego NXT robotic rover. The ultrasonic sensor is at the front of the... | Download Scientific Diagram Lego NXT robotic rover. The ultrasonic sensor is at the front of the... | Download Scientific Diagram](https://www.researchgate.net/profile/Rupert-Young-4/publication/317005478/figure/fig1/AS:614004657504271@1523401526372/Lego-NXT-robotic-rover-The-ultrasonic-sensor-is-at-the-front-of-the-rover-and-the-light_Q640.jpg)
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