/*
  Basic Wattmeter
 
 Reads AC voltage generated by a current clamp on an analog input pin, then prints the results to the serial monitor.
 
 The circuit:

 * Current clamp connected to analog pin 5 and GND.
 
 created by Didier Donsez
 
 */
 const long CLAMP_COEF=55; // dependent of the clamp (mine is a Chacon Ecowatt 850)
 const int CLAMP_PIN=5;
 
 void setup() {
  Serial.begin(9600); 
 }
 
 void loop() {
  // loop in order to read the AC voltage signal generated by the clamp
   int analogValue;
   long value=0;
   for(int i=0;i<1024;i++){
     analogValue = analogRead(CLAMP_PIN);
     value+=analogValue;
     delay(1); // 2*10*50Hz
   }
   
   value=value/CLAMP_COEF;
   
   // print the result:
   Serial.print(value);
   Serial.println(" Wh");
   
   // wait 1000 milliseconds before to compute the next value

   delay(1000);
 }