hi guys
Iam trying to stop DC Motor(power given through battery on arduino) connected to a Arduino if the load weight is high than our required rate.Basically i want to create a device which stops the dc motor connected to a arduino which is interfaced with weight sensors.
You will almost certainly need some interface between the Arduino and the motor, such as a relay or switching transistor, unless it's a VERY tiny motor. It will probably need an independent power supply too. Not to mention back EMF protection.
You will also need to know what the characteristics of the load cell are.
I suggest that you find datasheets for the devices that you are considering online and post links here, then we may be able to give more specific help. It's probably going to be relatively easy, but you do need to know exactly what it is that you want to do.