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)...
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?