Line follower robot using PID ROS

Job ID: 32790173

Budget: $30 – $250 USD

Hello

I already got the robot working with following a line using HSV, raspberry pi 3, ROS kinetic and its motor.
The robot moves around but it is not smooth at all.
I need help with implementing ros PID to this robot so it become smoother. Therefore I need an expert help to implement PID on my code. I have already a code example that may help.

I prefare to have online chat to solve this problem because there is no other way to solve, because I have all the hardware here.

PLEASE PLEASE PLEASE do not apply if you dont have the enough experience for this task. Donot waste my time and yours.
I prefare to start the conversation directly now if possible