Shubra Qubala IT Project - Water Sensor code for the Arduino processor

Water Sensors.ino

/* 
 Allebrum, LLC (www.allebrum.com)
 Senica Gonzalez - senica@gmail.com 
 
 Manual for packet assembly and options can be found here:
 ftp1.digi.com/support/documentation/90000976_M.pdf
 
 ultrasonic module ping distance sensor 
 VCC to arduino 5v GND to arduino GND
 Echo to Arduino pin 3; Trig to Arduino pin 4
 */
 
#include<stdlib.h>

#define trigPin 4
#define echoPin 3

byte buffer[254]; //Buffer for message
byte serial[8]; //Array for Serial Address
byte address[2]; //Array for Network Address
unsigned int j; //Keep track of buf location

void setup(){ 
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
} 

void setSerial(byte one, byte two, byte three, byte four, byte five, byte six, byte seven, byte eight){
  serial[0] = one; serial[1] = two; serial[2] = three; serial[3] = four; serial[4] = five; serial[5] = six; serial[6] = seven; serial[7] = eight; 
}

void setAddress(byte one, byte two){
   address[0] = one; address[1] = two; 
}

void createPacket(float water, float sound, float temp, float humidity){
  memset(buffer, 0, sizeof(buffer)); //Initialize the buffer
  char w[10], s[10], t[10], h[10];
  dtostrf(water,0,2,w); dtostrf(sound,0,2,s); dtostrf(temp,0,2,t); dtostrf(humidity,0,2,h);
  String data = "{\"water\":\""+String(w) +"\", \"sound\":\""+ String(s) +"\", \"temp\":\""+ String(t) +"\", \"humidity\":\""+ String(h) +"\"}";
  j = 0;
  buffer[j++] = 0x7E; //Start byte
  buffer[j++] = 0x00; //Start length
  buffer[j++] = (byte)(data.length() + 14); //Length of Data + the following 14 bytes
  buffer[j++] = 0x10; //Frame type - see documentation
  buffer[j++] = 0x01; //Frame ID for host to send ACK to, should probably be random but must be non-zero
  for(int i=0; i<sizeof(serial); i++) //Serial address of node to send packet to. For the coordinator you can use all 0x00's or the actual serial number
     buffer[j++] = serial[i];
  for(int i=0; i<sizeof(address); i++) //Network address of node. If you don't know it, you can use {0xFF, 0xFE}. The ACK will contain the network address.
     buffer[j++] = address[i];
  buffer[j++] = 0x00; //Broadcast radius
  buffer[j++] = 0x00; //Options
  for(int i=0; i<data.length(); i++) //Pack in the data
     buffer[j++] = (byte)(data[i]);

  //Calculate checksum
  int checksum = 0;
  for(int i=3; i<sizeof(buffer); i++){
    checksum += buffer[i];
  }
  buffer[j++] = 0xFF - (checksum & 0xFF); //Checksum is configured by subtracting the lower 8 bits of the sum of the bytes between offset 3 and the checksum from 0xFF. 
  
  Serial.write(buffer, j);
}

float waterLevel(){
  
  float duration, distance, mm;
  
  //Send trigger to request new measurement
  digitalWrite(trigPin, HIGH); delayMicroseconds(1000); digitalWrite(trigPin, LOW);
 
  //Measure how long the echoPin is HIGH - this is the duration 
  duration = pulseIn(echoPin, HIGH); 
  
  /**
   * Calculate the distance in millimeters
   * Divide by two because the duration is the time it takes for the sound to travel to an object and back, we only want the time to the object
   * If you want to calculate cm, use: Pace of Sound D = (T / 2) / 29.1 OR D = (T x 0.0343) / 2 for example: distance = (duration / 2) / 29.1;
   */
  mm = ((( (duration / 2) * 1) * 344) / (0.001 / 0.000001)); 
  
  if(mm >= 4000) //If greater than 4000 (4m) we can't read it reliably
     return -1;
   
  return mm;
}

void loop(){
    
  setSerial(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); //Coordinator address OR use serial number
  setAddress(0xFF, 0xFE); //Coorinator network address when unknown
  createPacket(waterLevel(), 0, 0, 0);
  delay(3000); //Wait 3 seconds before next reading
}