Automated Green House Blog:8 -  Water Usage

/* This script is used to make sense of the output from a hall effect water flow meter and make a note of any problems

Michael Ratcliffe  Mike@MichaelRatcliffe.com

    This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program.  If not, see <http://www.gnu.org/licenses/>.

    Components:

    See main folder for sensor data sheets, required liabaries and extra information: [can be downloaded via www.michaelratcliffe.com]

    All power systems should be powerd of DC voltage of below 48v for safter [water is around] 12v is prefferable and cheapest. As always this is a DIY project and done at your own risk.

    >Arduino Mega 2560 [1280 is not sutiable, ram problems and sensor conflict] compiled using Arduino 1:1.0.5

    >Hall Effect Water Flow Meter 5v

*/

//******************************** User Defined Variables *******************************************************// 

#define Meter_power  5

#define Meter_ground 4

#define Water_pin 3

float Click_Per_L = 300; // this depends on your flow meter

const float Max_ExpectedFlow =2; //Max flow expected flowrate in L/s, if it is more than this we have a problem

//************************** Just Some basic Definitions used for the Up Time LOgger ************//

long Day=0;

int Hour =0;

int Minute=0;

int Second=0;

int HighMillis=0;

int Rollover=0;

//***************************** End Of User Defined Variables **************************************************//

unsigned long PulseCount=0;  //counter for water meter pulses

unsigned long Current_PulseCount=0;

int Last_Reading=0;

int Readings=0;

float Water_Used=0;

float Flow_Rate= 0;

unsigned long Last_Count =0;

//**************************** Setup Routine , Runs Once and Sets used pins to correct value *******************//

void setup() {

//Making it easy to power the Flowmeter        

pinMode(Meter_ground, OUTPUT);

digitalWrite(Meter_ground, LOW);

pinMode( Meter_power, OUTPUT);

digitalWrite(Meter_power, HIGH);

//Stoping noise from being a problem, pin is high untill hall sensor pulls it low

pinMode(Water_pin, INPUT);

digitalWrite(Water_pin, HIGH);// saves having an external pullup

//External Interrupts: This is what the watr meter pulse count is collected from      

attachInterrupt(1, WaterCounter, FALLING);  //watermeter pulse output connected to pin3

};

//************************************** Main Loop that will continualy run ******************************************//

void loop(){

//calls uptime function below main loop

uptime();

//************** If Statment that will run every second ******************// 

           if (Last_Reading!=Second) {

            Last_Reading=Second; //Makes note of the last second

            Readings=1;          //Tell serial there is data to transmit

            //Turn off interupt while we take a quick note of it and then turn it back on

            detachInterrupt(1); //

            Current_PulseCount=PulseCount; // making note of pulse count

            attachInterrupt(1, WaterCounter, FALLING);  //watermeter pulse output connected to pin3

            Flow_Rate=((Current_PulseCount-Last_Count)/Click_Per_L);  

            Water_Used=(1/(Click_Per_L/Current_PulseCount)); //cant recall why I did it this way, maybe to retain float capabilities

            Last_Count=Current_PulseCount;                   // Makes a note of the last reading

                                    };

//**** Checks If there is Data To send over Serial- Recomended to be LCD instead ******//

if (Readings==1){

print_Serial();

}

delay(10); 

};

//*************************************************END OF LOOP ******************************************************//

//******************* Uptime Counter **************************************************//

//WE need an uptime counter to verify our total flow readout is valid

void uptime(){

//** Making Note of an expected rollover *****// 

if(millis()>=3000000000){

HighMillis=1;

}

//** Making note of actual rollover **//

if(millis()<=100000&&HighMillis==1){

Rollover++;

HighMillis=0;

}

long secsUp = millis()/1000;

Second = secsUp%60;

Minute = (secsUp/60)%60;

Hour = (secsUp/(60*60))%24;

Day = (Rollover*50)+(secsUp/(60*60*24));  //First portion takes care of a rollover [around 50 days]                  

};

//******************** Prints To Serial Console **********************************************************//

void print_Serial(){

//Printing Some Uptime Values

  Serial.print(F("Uptime: ")); // The "F" Portion saves your SRam Space

  Serial.print(Day);

  Serial.print(F("  Days  "));

  Serial.print(Hour);

  Serial.print(F("  Hours  "));

  Serial.print(Minute);

  Serial.print(F("  Minutes  "));

  Serial.print(Second);

  Serial.println(F("  Seconds"));

//Printing Some Water Flow info

  Serial.print(F("Total Water Used"));

Serial.print(Water_Used);

Serial.println(F(" L"));

Serial.print(F("Current Flow Rate: "));

Serial.print(Flow_Rate);

  Serial.println(F(" L/s"));

};

//************8*Interupt routine for water meter readings - Runs everytime sensor has a pulse *************//

void WaterCounter() {

   // Increment the pulse counter

  PulseCount++;

};