dwblair/dwbPulseTimer.ino

## dwbPulseTimer.ino
long pulseCount = 0;  //a pulse counter variable

unsigned long pulseTime,lastTime, duration, totalDuration;

int samplingPeriod=2; // the number of seconds to measure 555 oscillations

int fivefivefive = 13; // the pin that powers the 555 subcircuit

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

      pinMode(fivefivefive, OUTPUT);

}

void loop()
{
  delay(1000); // imagine riffle is doing other stuff (like sleeping)

  // now make a conductivity measurement

  //turn on the 555 system
  digitalWrite(fivefivefive,HIGH); //turns on the 555 timer subcircuit

  pulseCount=0; //reset the pulse counter
  totalDuration=0;  //reset the totalDuration of all pulses measured

  attachInterrupt(1,onPulse,RISING); //attach an interrupt counter to interrupt pin 1 (digital pin #3) -- the only other possible pin on the 328p is interrupt pin #0 (digital pin #2)

  pulseTime=micros(); // start the stopwatch

  delay(samplingPeriod*1000); //give ourselves samplingPeriod seconds to make this measurement, during which the "onPulse" function will count up all the pulses, and sum the total time they took as 'totalDuration'

  detachInterrupt(1); //we've finished sampling, so detach the interrupt function -- don't count any more pulses

  //turn off the 555 system
  digitalWrite(fivefivefive,LOW);

  if (pulseCount>0) { //use this logic in case something went wrong

  double durationS=totalDuration/double(pulseCount)/1000000.; //the total duration, in seconds, per pulse (note that totalDuration was in microseconds)

  // print out stats
  Serial.print("sampling period=");
  Serial.print(samplingPeriod);
    Serial.print(" sec; #pulses=");
  Serial.print(pulseCount);
  Serial.print("; duration per pulse (sec)=");
  Serial.println(durationS,4);

  }
  }


void onPulse()
{
  pulseCount++;
  //Serial.print("pulsecount=");
  //Serial.println(pulseCount);
  lastTime = pulseTime;
  pulseTime = micros();
  duration=pulseTime-lastTime;
  totalDuration+=duration;
  //Serial.println(totalDuration);
}
	long pulseCount = 0; //a pulse counter variable

	unsigned long pulseTime,lastTime, duration, totalDuration;

	int samplingPeriod=2; // the number of seconds to measure 555 oscillations

	int fivefivefive = 13; // the pin that powers the 555 subcircuit

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

	pinMode(fivefivefive, OUTPUT);

	}

	void loop()
	{
	delay(1000); // imagine riffle is doing other stuff (like sleeping)

	// now make a conductivity measurement

	//turn on the 555 system
	digitalWrite(fivefivefive,HIGH); //turns on the 555 timer subcircuit

	pulseCount=0; //reset the pulse counter
	totalDuration=0; //reset the totalDuration of all pulses measured

	attachInterrupt(1,onPulse,RISING); //attach an interrupt counter to interrupt pin 1 (digital pin #3) -- the only other possible pin on the 328p is interrupt pin #0 (digital pin #2)

	pulseTime=micros(); // start the stopwatch

	delay(samplingPeriod*1000); //give ourselves samplingPeriod seconds to make this measurement, during which the "onPulse" function will count up all the pulses, and sum the total time they took as 'totalDuration'

	detachInterrupt(1); //we've finished sampling, so detach the interrupt function -- don't count any more pulses

	//turn off the 555 system
	digitalWrite(fivefivefive,LOW);

	if (pulseCount>0) { //use this logic in case something went wrong

	double durationS=totalDuration/double(pulseCount)/1000000.; //the total duration, in seconds, per pulse (note that totalDuration was in microseconds)

	// print out stats
	Serial.print("sampling period=");
	Serial.print(samplingPeriod);
	Serial.print(" sec; #pulses=");
	Serial.print(pulseCount);
	Serial.print("; duration per pulse (sec)=");
	Serial.println(durationS,4);

	}
	}


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