hi, I want to read 3x13 status leds by sticking fotocells on them (long story). My assumtion is analog multiplexer and I got myself 3x a HI3-506A-5 to connect to an Arduino Mega. Digital out pin 30-33 control the address lines (orange in the diagram) - rather than doing this 3x and use 12 outputs …

Address line selection failing - multiplexer only returning input 1 (HI-506A-5)

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