   analogWrite(pwmVRefPin, 0);
   pinMode(pwmIRefPin, OUTPUT);
   analogWrite(pwmIRefPin, 0);
+  
+  pinMode(LEDPin, OUTPUT);
+  
+//  for (int pin=1;pin<=12;pin++){
+//    pinMode(pin, OUTPUT);
+//    analogWrite(pin, 50);
+//  }
 }
 
 // load settings from EEPROM
 void loadSettings() {
   // read from EEPROM
   isFirstRun = int(EEPROM.read(1));
+  digitalWrite(LEDPin,isFirstRun);
   isStreamingSensorData = int(EEPROM.read(2));
   sensorA0ZeroVoltReference = readSensorValueFromEEPROM(3);
   sensorA0OtherReference = readSensorValueFromEEPROM(5);

// time between samples in milliseconds
const int sampleInterval = 200; 
// digital & analog I/O pin setup
const int pwmVRefPin = 5;
const int pwmIRefPin = 6;
const int VsensePin = A0;
const int IsensePin = A1;
// measurement variables
int sensorBufferLength = 5;
int analogSensorA0Value = 0;

  updateVRefPwmValue();
  updateIRefPwmValue();
  sampleSensors();
  // fix for some compilers: not called if deeply nested
  analogWrite(pwmIRefPin,IRefPwmValue);
  analogWrite(pwmVRefPin,VRefPwmValue);
}

// function for initializing sample buffers to all zeros
