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pThe Sharp Distance Sensor 2y0a21 is wide angel distance measuring sensor with accurate measurment used for many DIY projects.  It has an analog output that varies from 3.1V at 10cm to 0.4V at 80cm.  It can be used for touch less switch, DIY robots. It is united with PSD infrared LED and signal processing circuit. The voltage output in this device is corresponding to the detection distance./p

pSharp Distance Sensor  2y0a02 is a distance measuring sensor unit. This sensor is great for sensing objects up to 5 feet away. It can be used for touch-less switch, sensor for energy saving, for detection of human body. It can also find the distance to objects that present a very narrow edge, It has Infrared Proximity Sensor and can measure  the distance form 20 cm to 150 cm ./p