Added arduino libs

libraries/SimplePID-master/SimplePID.h

@@ -0,0 +1,36 @@
+// SimplePID.h - Definitions for the simple PID library.
+
+#ifndef SIMPLE_PID_H
+#define SIMPLE_PID_H
+
+class SimplePID {
+  public:
+
+    SimplePID(float Kp, float Ki, float Kd);
+
+    void setConstants(float Kp, float Ki, float Kd);
+    
+    void setOutputRange(float minOutput, float maxOutput);
+
+    void setSetPoint(float setPoint);
+
+    float getCumulativeError();
+
+    void clearCumulativeError();
+
+    float getControlValue(float actual, float dt);
+
+  private:
+  
+    float Kp;
+    float Ki;
+    float Kd;
+    float setPoint;
+    float minOutput;
+    float maxOutput;
+    float lastActual;
+    float sumError;
+
+};
+
+#endif SIMPLE_PID_H