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Weird readings from my two GP2Y0A02YK sharp IR sensors

Hi guys

I am new member to this website and i am already having a problem.

i am working on my final year project and i am using GP2Y0A02YK sharp IR sensors. the problem i am facing is with the repeatability of the readings, which is very poor, meaning that i get different readings for the same distance and sometimes these readings are far from what is supposed to indicate.

i hope my problem is clear and i look forward to hearing from you.