Hey there I am making a robotic car with arms project in which I have to rotate 4 servos 2 servos simultaneously and 2 at different times
I have connected a 11 v 2.7 amp battery pack of 18650 batteries in series to hw 130 Arduino motor shield
And USB power to Arduino Uno @5v
I am running 4 5volt dc motors using the shield
I tried running the 4 servos through the 5v outputs that the motor shield provides
But now my Arduino is not getting flashed and all the lights on it are on
I think I've burned the board and suspect a power surge due to the servos
What power supply should I use for the servos
And someone please help me with the connections too as I am new to this
I am thinking of two different supplies one for the servos one for the shield and one for Arduino
How should I go about it ?
It is always a proper approach to separate the power supply for the logic and actuators.
It would be helpful if you posted an annotated schematic. You have listed a bunch of parts but not how they are connected. This is important in helping to solve your problem.
Hi,
You have got the gnd of the Uno connected to the gnd of the servos' power supply?
Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Please not cut/paste of images connected with coloured lines.
Do you have a DMM?
Did you write code for JUST each piece of hardware before connecting them all up?
That way you prove your control circuit and code for each device before combining them.
It cut debugging down quite a bit.
Thanks.. Tom.. 
The s3003 is a standard size hobby servo, generally those were powered by a pack of four nicad rechargeable batteries. Allow at least an amp or so for each servo, the motor shield is not going to be adequate.