COB Security Light

#include <NewPing.h>

#define TRIGGER_PIN  2
#define ECHO_PIN     3
#define ALERT_PIN    4
#define MAX_DISTANCE 200
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);


int time_on = 2000;



void setup() {
  Serial.begin(115200);
  pinMode(ALERT_PIN,OUTPUT);
  pinMode(13,OUTPUT);
  digitalWrite(ALERT_PIN,LOW);
}

void loop() {
   int test = (sonar.ping_cm());
   if (test < 50 && test >0){
   digitalWrite(ALERT_PIN,HIGH);
   digitalWrite(13,HIGH);
    delay(time_on);
    digitalWrite(ALERT_PIN,LOW);
    digitalWrite(13,LOW);
   }


  delay(100);
  Serial.print("Ping: ");
  Serial.print(test);
  Serial.println("cm");




}