/*
 ******************************************************************************
 *  Copyright (c) 2015 Particle Industries, Inc.  All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************
 */
/* HC-SR04 Ping / Range finder wiring:
 * -----------------------------------
 * Particle - HC-SR04
 *      GND - GND
 *      VIN - VCC
 *       D2 - TRIG
 *       D6 - ECHO
 */
//if A0 and not A1 then open. if not then closed...
#include "application.h"
int ledPin = D1;
// Our button wired to D0
int buttonPin = D4;
int buttoncount=0;
void setup() {
    Serial.begin(115200);
    pinMode( buttonPin , INPUT_PULLUP); // sets pin as input
    // We also want to use the LED
    pinMode( ledPin , OUTPUT ); // sets pin as output
}
void loop() {
    // Trigger pin, Echo pin, delay (ms), visual=true|info=false
    int buttonState = digitalRead( buttonPin );
   if( buttonState == LOW )
   {
     // turn the LED On
     // Monitor height of Compost
     digitalWrite( ledPin, LOW);
     int prevDist = ping(D2, D6, 250, false);
     delay(5000);
     int currDist = ping(D2, D6, 250, false);
     if (currDist < prevDist) {
       Particle.publish("Compost height increased");
       buttoncount = buttoncount +1;
          if( buttoncount == 5){
            Particle.publish("Please stir the Compost");
            buttoncount = 0;
   }else{ //bin open
     // Counting times bin is opened/closed
     digitalWrite( ledPin, HIGH);
     //Particle.publish("Compost has been added!");
        }
     delay(5000);
     }
  }
}
int ping(pin_t trig_pin, pin_t echo_pin, uint32_t wait, bool info)
{
    uint32_t duration, inches, cm;
    static bool init = false;
    if (!init) {
        pinMode(trig_pin, OUTPUT);
        digitalWriteFast(trig_pin, LOW);
        pinMode(echo_pin, INPUT);
        delay(50);
        init = true;
    }
    /* Trigger the sensor by sending a HIGH pulse of 10 or more microseconds */
    digitalWriteFast(trig_pin, HIGH);
    delayMicroseconds(10);
    digitalWriteFast(trig_pin, LOW);
    duration = pulseIn(echo_pin, HIGH);
    /* Convert the time into a distance */
    // Sound travels at 1130 ft/s (73.746 us/inch)
    // or 340 m/s (29 us/cm), out and back so divide by 2
    // Ref: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
    inches = duration / 74 / 2;
    cm = duration / 29 / 2;
    if (info) { /* Visual Output */
        Serial.printf("%2d:", inches);
        for(int x=0;x<inches;x++) Serial.print("#");
        Serial.println();
    } else { /* Informational Output */
        Serial.printlnf("%6d in / %6d cm / %6d us", inches, cm, duration);
    }
    return inches;
    //delay(wait); // slow down the output
}