raschemmel:
Yeah, that's not going to work. There is something wrong with your "adaptor" setup that you are not telling us. What do you mean by "switch off my adaptor " ?You understand that if you had a real switch in series with the adaptor voltage to the relay coil and you opened that switch it would be impossible for there to be ANY voltage on the relay coil so this means there is something about your adaptor wiring or setup that you are not telling us. Post a link for the adaptor and a photo of the adaptor showing the writing on the label and also a photo of the actual wiring of the adaptor.
Try unplugging the "adaptor" from the wall.
Post a vendor link for the adaptor.
Try putting a 1 k ohm resistor across the relay coil.
hello sir.. thanks for your sincere support...
sir i changed adapter and battery with an arduino board...i use 5v and 3.3 v but still remains that issue...i made more checking...even after i switch off adapter supply there will be a 2.7v across the relay coil ..and when i disconnect battery the coil voltage going to zero...but i dont know how it is...there is no connection between battery source and relay coil in my circuit .here i am attaching my complete circuit and photo of my board , i hope you can help me i am attaching the full circuit and photo of my board here..i hope you can help me