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Added a few links to help you understand how a light sensor works and how to set it up. Hope this helps.

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Make a Light Sensor in Robotics

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This is an introduction to the NXT's Light Sensor. It contains instructions on how to create a program that will display calibrated light sensor values. Using this program you can see what the light sensor sees. This will help you understand the light sensor better.

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A Light Sensor is something that a robot can use to detect the current ambient light level - i.e. how bright/dark it is. There are a range of different types of light sensors, including 'Photoresistors', 'Photodiodes', and 'Phototransistors'. The sensor included in the BOE Shield-Bot kit, and the one we will be using, is called a Phototransistor.

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When a communication is to be established, that too wirelessly, with a remote device, we typically employ optical radiations or radio waves or sometimes, acoustic waves (for underwater applications). These three types of wireless communications basically differ in their frequencies. All frequencies starting from frequency bands like LF, HF, VHF, UHF and so on, extending...

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We have already discussed how a light sensor works. IR Sensors work by using a specific light sensor to detect a select light wavelength in the Infra-Red (IR) spectrum. By using an LED which produces light at the same wavelength as what the sensor is looking for, you can look at the intensity of the received light.