dwbPulseTimerInterrupt.io

//long pulseCount = 0;
unsigned long pulseTime,lastTime, duration;

void setup()
{
  Serial.begin(9600);

// KWH interrupt attached to IRQ 1  = pin3
  attachInterrupt(1, onPulse, FALLING);
}

void loop()
{
  
  
}

void onPulse()
{
  //pulseCount++;
  lastTime = pulseTime;
  pulseTime = micros();
  duration=pulseTime-lastTime;
  float durationS=duration/1000000.;
  Serial.print("duration=");
  Serial.println(durationS);
}