IR Object Detection

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i have 4 digital pins remaining on arduino, have matrix of leds lit 9x6, there 9 led's in each section , when detects object infront of leds around light up. know how light leds have come mishap on how going detect objects infront of them. can use 6 analog inputs photodiodes inputs dont know how turn on the ir emmitters each section (i have 2 per section 1 fine)

sorry bad wording troubling on late @ night

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