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I have an Arduino uno board, I want to build a pick & place bot and thus I need powering two servos, when I power them by computer they work as excepted but then I powered it with a battery, nothing worked, two batteries in parallel that provide 18V, nothing worked, then a LM7805 circuit, nothing worked.

Can you suggest a way for solve this, please I want to summit this project in this week.

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What motor drivers do you use? You don't try to run the motors off the arduino directly, don't you? – ansi_lumen yesterday
    
I was not able to understand what you are saying but I have tried powering it by arduino power supply and different 5v power supply – vedang joshi yesterday
    
hmm, don't get this wrong, but you should start with the basics. There are plenty of tutorials out there about arduinos and stepper motors, to start with. – ansi_lumen yesterday
    
@ansi_lumen the question does not concern stepper motors. – Chris Stratton yesterday
    
I tried, It improved the situation little, but then too it is far away from saying as excepted – vedang joshi yesterday
up vote 0 down vote

A common problem is the common ground. You need to connect all GND from multiple power sources to one common ground. If you run the arduino from a battery and the motors from another battery, you have to connect both grounds.

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