Added data labeling task 2 assigned to shubham(10)

PID code.ino

@@ -0,0 +1,39 @@
+int analogPin = 3;     // connected to pressure sensors (middle terminal) connected to analog pin 3
+
+int Kp ;//constant multiplied with the Proportional to fine tune the system
+int Ki ;//constant multiplied with the integral part to fine tune the system 
+int Kd ;//constant multiplied with the differential part to fine tune the system                       
+int val = 0;           // variable to store the value read
+int p ;
+int i ;
+int d ;
+int e ;
+int s ;
+int t1;
+int t2=1;
+
+void set (int sp,int p,int i,int d)
+{
+  s=sp;
+  Kp=p;
+  Ki=i;
+  Kd=d;
+}
+
+
+void setup()
+{
+  Serial.begin(9600);              //  setup serial(9600 times the arduino chip will commuicaten with the computer
+}
+
+void loop()
+{
+  t1++;
+  val = analogRead(analogPin);     // read the input pin
+  Serial.println(val);             // debug value
+  e = s-val; 
+p=e*Kp;
+i=(i+e)*Ki;
+d=((e-d)/(t2-t1))*Kd;
+t2++;
+}