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KEYES ALS Infrared LED Optics Proximity Ranging Module for Arduino
TMD2771X sensor has three features: ambient light£¬ proximity sensor and infrared LED. It plays a main role in mobile phone about two aspects. First£¬ this sensor is applied to detect the current brightness of ambient light£¬ adjust automatically the brightness of backlit with software according to the current brightness of ambient light to adapt to ambient brightness£¬ and make the brightness of backlight gentle to protect vision and save power. Second £¬ that is proximity sensor. Judge whether the mobile phone is close to face by the reflex of LED launching infrared and the reception of built-in PD£¬ and thereby determined the status of backlit and touch screen button ON/OFF. Its biggest advantage lies in integrating infrared transmitting tube inside without external support of LED. Besides£¬ the sensor with three features has integrated transceiving and minimized design without limitation of space. Its structure is simpler.