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you do have to watch out for overflow conditions. millis() overflows in 49 days, some of your "accumulators" might run out of room well before then too. Floating point is convenient, but the raw adc data is bits and might be more accurately accumulated in a double, or a int64_t if you have room. Adding 1024 to itself, 5 times per second will overflow a int32 in 4 days. Dunno if it matters though, depends how accurate it needs to be.
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