Dog Sensor

//Defining variables
unsigned long duration, inch, setdistance, setdistanceinch, diff;
int trigPin = 2;
int redPin = 3;
int yellowPin = 4;
int greenPin = 5;
int echoPin = 6;

void setup()
{
    //Defining inputs and outputs
    pinMode(redPin, OUTPUT);
    pinMode(yellowPin, OUTPUT);
    pinMode(greenPin, OUTPUT);
    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
    pinMode(D7, OUTPUT);
    Particle.subscribe("MotionAlert",UltrasonicCheck,"e00fce68a308ce520fe51aac"); //This particle only activates after recieving a confirmation saying that the other argon has detected motion.
    setdistanceinch = 0;
    Serial.begin(9600);
}

void UltrasonicCheck(const char *event, const char *data)
{
    delay(10); //lines 23 - 30 output and collect the soundwave, get a duration in
    //terms of microseconds, convert that time to distance since we know how fast sound travels
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW); 
    duration = pulseIn(echoPin, HIGH);
    inch = (duration/2) / 74; //divides time in half since wave has to go both there and back,
    //divides by 74 since that is the time it takes for sound to travel one inch.

    
    if (inch <= 18){ //Checks if there is anything within 18 inches of the sensor.
        //if there is, the loop will upload a "1" to the cloud
        setdistanceinch = 0; //redefine our set distance to zero so we can move into red zone if the 
        //setdistance was previously set to 20-24 inches
        Particle.publish("UltraDetected", "1");
        digitalWrite(redPin, HIGH);  
        delay(5000); //delay 5 seconds 
        digitalWrite(redPin, LOW);
        setdistanceinch = inch; //defines distance so we must change from this (EITHER direction) 
            //4 inches before lighting code will run again.
    }
    else {
       delay(500); //delay half second when outside of 18 inch range
    }
    
}

int buzzerPin = 6;                //Buzzer pin

void setup() {
pinMode(D6, OUTPUT);    //sets the passive buzzer to be an output

    Particle.subscribe("UltraDetected",Ultrasonic,"e00fce68a308ce520fe51aac");   
}

//The buzzer is the last step in the process. 
// If the motion sensor detects motion it sends a signal to the ultrasonic sensor asking to double check if something is there
// If the ultrasonic sensor says something is there it will send a signal back to the motion sensor which will activate thsi loop from the subscribe above. 
// The buzzer will only sound if both the motion sensor and ultrasonic sensor have detected motion.


//code for passive buzzer beeps
void Ultrasonic(const char *event, const char *data)
{
    beep();

    Particle.publish("BothChecked", "Send to buzzer");
   
}
    
    
    
void beep() {
    tone(D6, 3000, 50);
  
}