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suhasm
05-02-2009, 08:50 PM
There are many types of photo sensors like LDRs , Ir Sensors like TSOP17xx , Photodiodes , Phototransistors ect...

If you can tell us about you application , we can help you...

If you intend to use the photoelectric sensors for detecting the presence of an object , then using a Ir source along with a TSOP17xx series sensor would be most appropriate..

Otherwise , you can also use ultrasonic sensors if you are not particular about the type of sensor involved...