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//cosntants for the pins where sensors are plugged into.
const int sensorPin = 2;

//Set up some global variables for the light level an initial value.
int lightInit;  // initial value
int lightVal;   // light reading
volatile int interruptCounter;

void IRAM_ATTR chan1_isr() {
  interruptCounter++;
  }
 
void setup()
{
  pinMode(sensorPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(sensorPin), chan1_isr, CHANGE);
 
  lightInit = analogRead(sensorPin);
  Serial.begin(115200);
  //we will take a single reading from the light sensor and store it in the lightCal        //variable. This will give us a prelinary value to compare against in the loop
}

void loop()
{

  lightVal = analogRead(sensorPin); // read the current light levels

  //if lightVal is less than our initial reading withing a threshold then it is dark.
  //if(lightVal - lightInit <  50)
  if(lightVal <  50)
  {
      Serial.println(lightVal);
      Serial.println("Night Time");
      Serial.println("Count: " + String(interruptCounter));
  }

  //otherwise, it is bright
  else
  {
    Serial.println(lightVal);
    Serial.println("Day Time");
    Serial.println("Count: " + String(interruptCounter));
  }

delay(1000);

}