I’m creating a small project with an Arduino nano, everything will be powered by 3 1,5V Lr14C batteries and mounted with a switch turned on only when the Arduino will be used so I'm not really concerned about the durability.Eventually the batteries will discharge and I need to create a circuit that turns on a led when the voltage drops too low (I think under 3,3v may be the operative limit).I explored many possibilities and I'm going nut finding a solution,at this point I think a comparator might be the answer but I have no idea how to set the control voltage at that point without using power draining or over-complicated solutions.Thanks all.
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