Yes that was the issue, I connected the ground from the motor driver to the arduino and its working perfect now. Air is being sucked in and blown out of the motors now.
Appreciate the help guys, you saved my final year project. 
Yes that was the issue, I connected the ground from the motor driver to the arduino and its working perfect now. Air is being sucked in and blown out of the motors now.
Appreciate the help guys, you saved my final year project.