/*
  ReadAnalogVoltage
  Reads an analog input on pin 0, converts it to voltage, and prints the result to the serial monitor.
  Graphical representation is available using serial plotter (Tools > Serial Plotter menu)
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

  This example code is in the public domain.
*/

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
}


float average = 0.0;
float threshold = 0.004;
int loops_to_blink=0;
int currentState=0; //ar lemputė įjungta ar išjungta
float diff=0.0;
// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 3,3V):
  float voltage = sensorValue * (3.3 / 1023.0);
  // Perskaičiuojame vidurkį po kiekvieno matavimo
  average = 0.98*average+0.02*voltage;
  // skirtumas
  diff = voltage-average;
  if (abs(diff)>threshold) {
    loops_to_blink=200;
    Serial.print("voltage:");
    Serial.println(voltage);
    Serial.print("diff*100:");
    Serial.println(diff*100);
    Serial.println("");
  }
  if (loops_to_blink>1) {
    loops_to_blink--;
    // šitas kodas parašytas, kad įjungti lemputė tik kai jį buvo išjungta
    // EFEKTYVUMO nekeičia
    if (currentState==0) {
      digitalWrite(LED_BUILTIN, HIGH);
    }
    currentState=1;
  }else{
    // šitas kodas parašytas, kad išjungti lemputė tik kai jį buvo įjungta
    // EFEKTYVUMO nekeičia
    if (currentState==1) {
      digitalWrite(LED_BUILTIN, LOW);
    }
    currentState=0;
  }
//  delay(10);

}