I am using a Leonardo to create a replacement control board for an air conditioner.The Leonardo is taking information from sensors, and controlling a bank of 8 relays.Part of the system requires an alarm (an LED) to remind the user to clean the air filters every, say, 1 year. What hardware do I need to add to the Leonardo to acheive this? Do I need a second Leonardo? It really ought to be able to remember where it has got to, and be able to carry on from there, if there's a power cut.Thanks for any suggestions.
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