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I using arduino mega 2560 to make fire Alarm Control Panel. The control panel takes 50 (inputs) supervised inputs. The normal way as per mention in the link i, use the analog inputs which am in short of ,in arduino. Is there any other way to monitor supervised input other than using analog inputs.

Thanks in advance for your time – if I’ve missed out anything, over- or under-emphasized a specific point let me know in the comments.