I'm working on an arduino project using a servo sg90 and a fingerprint sensor as608, but when I connect everything, every thing switches off

The arduino is connected through USB.

Powering the servo through the Uno is not a good idea.

Power the servo from it's own source of at least 800mA for the plastic geared servo.

Don't forget to connect the grounds.

what do you mean by from its own source?

A clump of batteries, a wall wart, build your own power supply...

Schematic?

the problem i dont have much knowledge in this things

But you will, by the time you get it working. That is why you came to the forum for help.

now what i can do to make it work

[quote="ahmednabil23, post:8, topic:943172, full:true"]
now what i can do to make it work
[/quote]Pay attention to the answers you are getting. Ask if you don't understand.

Arduino : How to Use a Servo Motor With an External Power : 5 Steps (with Pictures) - Instructables

I really appreciate your help. Thank you

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@ahmednabil23, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project.

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