const int ledPin = 13;   //led 1
const int buttonPin = 2; //Button to perform interrupt 
const int thresholdL = 100;
const int thresholdH = 400;
const int thresholdHH = 700;
int analogPin = A3; // potentiometer wiper (middle terminal) connected to analog pin 3
int val = 0;  // variable to store the value read
int x=0, y=0;            //some variables to increment 
int ledToggle = LOW;     //led state 
int ledPin_R = 10;
int ledPin_G = 9;
int ledPin_2 = 12;
int ledPin_3 = 11;
int vent = 8;
//variables to keep track of the timing of recent interrupts
unsigned long button_time = 0;  
unsigned long last_button_time = 0; 

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(buttonPin), button_ISR, CHANGE);
}

void loop(){
  int analogValue = analogRead(analogPin);
  // if the analog value is high enough, turn on the LED:
  if (analogValue < thresholdL) {
    digitalWrite(ledPin_G, HIGH);
    digitalWrite(ledPin_R, LOW);
     digitalWrite(vent, LOW);
  }
   if (analogValue > thresholdH) {
    digitalWrite(ledPin_R, HIGH);
    digitalWrite(ledPin_G, LOW);
     digitalWrite(vent, LOW);
  }
   if (analogValue > thresholdHH) {
    digitalWrite(ledPin_G, LOW);
    digitalWrite(ledPin_R, HIGH);
    digitalWrite(vent, HIGH);

 }
  if (digitalRead(ledPin == LOW))
  Serial.print("loop " );
  Serial.print(x++ );
  Serial.println();
  delay(500);
}

void button_ISR(){
  button_time = millis();
  //check to see if increment() was called in the last 250 milliseconds
  if (button_time - last_button_time > 250){
    Serial.print("Interrupt ");
    Serial.print(y++);
    Serial.println();
    ledToggle = !ledToggle;
    digitalWrite(ledPin, ledToggle);
    digitalWrite(ledPin_2, ledToggle);
    digitalWrite(ledPin_3, ledToggle);
    last_button_time = button_time;
    }
}