3_publish.ino

// 3_publish.ino
//
// Example robotics code for CODE @ TACC
// Summer 2016 robotics curriculum, available at:
//
// https://github.com/CODE-at-TACC/summer-2016
//
// Copyright 2016, Texas Advanced Computing Center
// GNU GPLv3 License

/******************************************
Included libraries
******************************************/
#include "codetacc-robotics/codetacc-robotics.h"

/******************************************
Variables
******************************************/

UltrasonicSensor ultrasonic = UltrasonicSensor(2, 4);
double distance = 0;

/******************************************
Custom functions
******************************************/


/******************************************
void setup()
Runs once upon startup
******************************************/

void setup() {
  Particle.variable("distance", distance);
  Particle.publish("hello");
}

/******************************************
void loop()
Runs forever
******************************************/

void loop() {
  distance = ultrasonic.readCm();
  // Add "if" code here
  if (distance > 0 && distance < 30) {
    Particle.publish("alert"); 
  }
  //
  delay(1000);
}