Arduino jitter experiment

jitterExperiment.C

// Ping of the LED's positive leg
int ledPin=7;

int state = 0;
int count;
unsigned long previousMillis = 400L;
double timer;

unsigned long interval = 3L;
unsigned long delta;
unsigned long waittime = 7L;

void setup()
{
  
// Pin that singals open/close valve
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  
  delta = waittime;
  
  delay(1000);
  
  Serial.begin(9600);
  Serial.println("Hello, I am awake.");
}

void loop()
{
    
    timer = micros()/10000.;
    if ( timer - previousMillis >= delta && state == 0 )
    {
        digitalWrite(ledPin, HIGH);
        previousMillis = timer;
        state = 1;
        Serial.print(micros());
        Serial.print(" - ");
        Serial.println(previousMillis);
        delta = interval;
    }
    
    timer = micros()/10000.;
    if ( timer - previousMillis >= delta  && state == 1 )
    {
        digitalWrite(ledPin, LOW);
        previousMillis = timer;
        Serial.print(micros());
        Serial.print(" - ");
        Serial.println(previousMillis);
        state = 0;
        delta = waittime;
    }

}