9844-1
Light Sensor is LEGO set 9844-1. It has a score of 77. This is average compared to all other sets. The set is recommended by 0 reviews, based on 2 scored reviews and 2 reviews total. It is ranked in the bottom 34.02% scored sets on Brick Insights. We know this set was released in 2006, and it is categorised in Mindstorms.
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This sensor can measure the level of ambient light, and can also measure how much light an object is reflecting using a red LED. By choosing in NXT-G (or any other environment) that the light sensor will generate light, you can also detect close objects (like the touch sensor does, but with light instead). This sensor is not quite as simple as the touch sensor, but is still very simple. It can replace the touch sensor in many situations, for example on roboarm only a light sensor is needed (it can detect close objects).