Hygro Petal => Just main loop and timeout

Hygro1.pde

// ------------------ M A I N ( ) --------------------------------------------
// Timeout handling
long timeoutInterval = 2000; // 2 seconds
long previousMillis = 0;
int counter = 0;

void timeout()
{
  // add code in here you want to 
  // execute every timeoutInterval seconds
}  

void loop() 
{
  // handle timeout function, if any
  if (  millis() - previousMillis > timeoutInterval )
  {
    timeout();
    previousMillis = millis();
  }
}