// This #include statement was automatically added by the Particle IDE.
#include <HC_SR04.h>


double cm = 0.0;
bool beam_status = false;

int trigPin = D4;
int echoPin = D5;
int led_pin_b = A0;
int led_pin_w = A1;

HC_SR04 rangefinder = HC_SR04(trigPin, echoPin);

void setup() {
    
 Spark.variable("cm", &cm, DOUBLE);
 
  pinMode(led_pin_b,OUTPUT);
   pinMode(led_pin_w,OUTPUT);
 
}

void loop() {
    
     cm = rangefinder.getDistanceCM();
    if (cm<15 ){
       digitalWrite(led_pin_b,LOW);
         digitalWrite(led_pin_w,HIGH);
        }
    else if (cm>15 && cm<30){
        digitalWrite(led_pin_w,LOW);
        digitalWrite(led_pin_b,HIGH);
        }
    else if(cm>30) {
        digitalWrite(led_pin_b,LOW);
        digitalWrite(led_pin_w,LOW);
        
    }
    delay(100);

}