Kanpur - A city of many resources but politically neglected

Sunday, December 5, 2010


hello every body,

Me back again with some information , some quaries for you .

So basically what is PID loop?
 It is Proportional, integral, derivative loop for any control situation in any industary ,device ,or any machine that need a precise working and caliberation to perform a very specific and important work in which a small error can lead to a loss and damage and irregularity in the desired output.

Just like if we take a example of a PID loop application in robotic arm which is used in PICK AND PLACE department in an industry.
and it work in autonomous mode.it has to pick a boul filled with hot chemical at 0degree(lets assume its initial position).and has to pour 50 ml of it in another boul placed at 60 degree and at 15 cm height.
so a PID lop must have some input from different sensors ,on which it will work, a microprocessor or CPU which will manipulate the inputs and will generate the desired output.

sensor 1= A digital compas which will give orientation of the arm in XY plane ,
sensor 2= a accelerometer and gyroscope which will give output along the height of the robotic arm .
a touch sensitive device which will sense the height of liquid in the boul .

now we had some specific PID loop terms that are need to be specify here.

Sensing the orientation along the XY plane,height and level of water is analogous to taking a measurement of the process value or process variable (PV).
The desired rotaion angle along XY plane ,along vertical plane and height of chemical in boul  is called the setpoint (SP).
The input to the process is called the manipulated variable (MV).
The difference between the PV  and the setpoint is the error (e), that quantifies whether the proper action has been taken place or not.

so here is the application of all the specific terms.now is the starting of the PID loop appliaction takes place.

In the very next blog i will discuss the theory  and thinking behind the process which take place in controlling the robotic arm .