first commit

EMONLIB_TRY_TIME/EMONLIB_TRY_TIME.ino

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+volatile unsigned long time1;
+    volatile unsigned long time2;
+    unsigned long time3;
+    volatile float ps;
+    volatile boolean data_available = false;
+   
+    void setup()
+          {
+          Serial.begin(9600);
+          Serial.println();
+          pinMode(A3,INPUT);   
+          pinMode(A5,INPUT);
+          attachInterrupt(A3,in1,RISING);     //enable ISR1 for voltage signal at rising from zero crossing
+          attachInterrupt(A5,in2,RISING);     //enable ISR2 for current signal at rising from zero crossing
+          interrupts();
+          }
+    void in1()
+    {
+               time1=micros();    //measure time in micro second for first zero crossing ISR1
+    }
+    void in2()
+    {
+               time2=micros();    //measure time in micro second for first zero crossing ISR2
+               data_available = true;
+    }
+           
+    void loop()
+    {
+               if (data_available == true)
+               {
+                  time3=time2-time1;
+                  ps = ((time3*360.0)*50/1000000); //calculate the phase shift from measured time difference
+                  Serial.print("Time1=");
+                  Serial.println(time1);
+                  Serial.print("Time2=");
+                  Serial.println(time2);
+                  Serial.print("Phase Shift = ");
+                  Serial.println(ps,6);
+                  Serial.print("degree\n\n");
+                  data_available = false;
+               }
+    }