Projects/Power Meter

Project: Power Meter
Beschrijving	Bitlair Power meter
Start	2012-07-07
Contact	Zarya
Status	Finished

• Meter url https://stats.bitlair.nl/

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

• 
  Meter
• 
  Electronic

Schema