MCU Response Time for voltage surge detection

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hello again.

i've been trying make electronic surge protector based on mcu. basic principle i'm using voltage divider , analog pins of arduino.

obviously 220v input scaled down 5v read on analog pin. code i'm writing going ping analogpin every 10 millis or less , whenever i/p voltage goes beyond, 290 volts switches off 2 pole contactor relay. no, issue there.

but here, i've observed vo

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