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wow did not see that before the ac grd of the relay contacts ...is it the same/joined to ac shown connected to mcu pin 20 ?sorry sir but i cant understand what u say
---------- Post added at 17:25 ---------- Previous post was at 17:20 ----------
this problem occured when a.c. device connect with relay.
Did you add protection diode to relay ?
Yes it is for ULN.
You are feeding your 5 volt regulator from the 12 v supply through the led and it's current limiting resistor, that will cause all sorts of problems by limiting the supply to 12 ma (approx)...