Projects/Power Meter

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Zarya 15155.jpg
Project Power Meter
Name Power Meter
Start 2012/07/07
End 2012-07-15
Contact Zarya
Website
Information Bitlair Power meter
Status Production

Code

#include <WProgram.h>
#include <inttypes.h>

#define MS_PER_HOUR    3.6e6

int cycles_per_kwh = 100;
int max_watt = 6000;
unsigned long previous = 0;
unsigned long cycle = 0;
boolean last = LOW;

void kwhChange() {
    unsigned long now = millis();
    unsigned long time = now - previous;
    if (cycle == 0) {
        cycle++;
        return;
    }
//    digitalWrite(13,last);
   previous = now;
   double W = 1000 * ((double) MS_PER_HOUR / time) / cycles_per_kwh;
   Serial.print("Cycle ");
   Serial.print(cycle, DEC);
   Serial.print(": ");
   Serial.print(time, DEC);
   Serial.print(" ms, ");
   Serial.print(W, 2);
   Serial.println(" W");
   cycle++;
   if (last) last = LOW;
   else last = HIGH;
}

void setup () {
  Serial.begin(57600);
  pinMode(13, OUTPUT);
  attachInterrupt(0, kwhChange, FALLING);
}

void loop () {
    digitalWrite(13,digitalRead(2));
}

Pictures

Schema

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