이민석백지원이중원Huijin Yang
Created July 13, 2018

Water Purifier Helper

Through this project, we are trying to make water quality checker and help people who are negatively affected by polluted water purifier.

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Schematics

Circuit Flow

Arduino Circuit

Appinventor blocks

Code

Arduino code

Arduino
#include <SoftwareSerial.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define SensorPin A1            //pH meter Analog output to Arduino Analog Input 0
#define Offset 0.00            //deviation compensate
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth  40    //times of collection
#define ONE_WIRE_BUS 2 //온도센서 디지털 핀번호 

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

int pHArray[ArrayLenth];   //Store the average value of the sensor feedback
int pHArrayIndex = 0;
int pin = 2;

//int DS18S20 = 3;
//OneWire ds(DS18S20);
 SoftwareSerial myserial(10,11);//TX,RX
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  myserial.begin(9600);
  sensors.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  static unsigned long samplingTime = millis();
  static unsigned long printTime = millis();
  static float pHValue, voltage, tak;
  //sensors.requestTemperatures();
  
  //Serial.println(takSensor);
  //Serial.println(temp);

  if (millis() - samplingTime > samplingInterval)
  {
    pHArray[pHArrayIndex++] = analogRead(SensorPin);
    
    if (pHArrayIndex == ArrayLenth)
    {
      pHArrayIndex = 0;
    }
    voltage = avergearray(pHArray, ArrayLenth) * 5.0 / 1024;
    pHValue = 3.5 * voltage + Offset;
    samplingTime = millis();
  }
  
  if ((millis() - printTime > printInterval))
  {
    int sensorValue = analogRead(A0);
    float volt = sensorValue * (5.0 / 1024.0);    

    //Serial.print(sensors.getTempCByIndex(0));
    sensors.requestTemperatures();
    float c = sensors.getTempCByIndex(0);
    
    if(pHValue>5.8 && pHValue < 8.4 && volt >= 3.8 && volt <= 4.4)
    {
      myserial.print("Quality is Good, \n");
      myserial.print("Temp : ");
      myserial.print(c);  
      myserial.println(" C");

      Serial.print("Good, ");
      Serial.print("Temp : ");
      Serial.println(c); 
    }
    else
    {
      myserial.print("Quality is Bad, \n");
      myserial.print("Temp : ");
      myserial.print(c);
      myserial.println(" C");

      Serial.print("Bad, ");
      Serial.print("Temp : ");
      Serial.println(c); 
    }
    delay(3000); //3초마다 Refresh
  }
}

double avergearray(int* arr, int number) {
  int i;
  int max, min;
  double avg;
  long amount = 0;
  if (number <= 0) {
    Serial.println("Error number for the array to avraging!/n");
    return 0;
  }
  if (number < 5) { //less than 5, calculated directly statistics
    for (i = 0; i < number; i++) {
      amount += arr[i];
    }
    avg = amount / number;
    return avg;
  } else {
    if (arr[0] < arr[1]) {
      min = arr[0]; max = arr[1];
    }
    else {
      min = arr[1]; max = arr[0];
    }
    for (i = 2; i < number; i++) {
      if (arr[i] < min) {
        amount += min;      //arr<min
        min = arr[i];
      } else {
        if (arr[i] > max) {
          amount += max;  //arr>max
          max = arr[i];
        } else {
          amount += arr[i]; //min<=arr<=max
        }
      }//if
    }//for
    avg = (double)amount / (number - 2);
  }//if
  return avg;
}

Mbed

C/C++
#include "mbed.h"
#include "SPI.h"
#include "MQTTEthernet.h"
#include "MQTTClient.h"

#define ECHO_SERVER_PORT   7
 
Serial pc(USBTX, USBRX);   //Enabling the Serial transmission between WIZ750SR and PC.
Serial serial(D1,D0);      // Enabling Serial transmission betwenn Wiz750SR and W7500. 
char c[100]="";
 
int main(void) {
    printf("Wait a second...\r\n");
    char* topic = "Vending machine";
    MQTTEthernet ipstack = MQTTEthernet();
    
    MQTT::Client<MQTTEthernet, Countdown> client = MQTT::Client<MQTTEthernet, Countdown>(ipstack);
    
    char* hostname = "172.16.73.4";   //Give the IP Address of the MQTT Broker.
    int port = 1883;                  // Port number of the MQTT broker.  
 
    int rc = ipstack.connect(hostname, port);
    
    if (rc != 0)
      printf("rc from TCP connect is %d\n", rc);
      printf("Topic: %s\r\n",topic);
    
    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
    data.MQTTVersion = 3;
    data.clientID.cstring = "parents";

    if ((rc = client.connect(data)) == 0)
      printf("rc from MQTT connect is %d\n", rc);
 
   while (true) {
    int i;
    c[i]=0;
    if (serial.readable()) // if anything available/ readable in Serial port 
    {
        
      for(i=0;i<=13;i++){
        char c1 =serial.getc();
        c[i] = c1;
      }
       pc.printf("The value returned is %s ",c);
       MQTT::Message message;
       char buf[100];
       sprintf(buf, "%s", c1);
       message.qos = MQTT::QOS0;
       message.retained = false;
       message.dup = false;

       message.payload = (void*)c;
       message.payloadlen = strlen(c);

       rc = client.publish("IOT", message);
       pc.printf("Rc result: %c \n ",rc);
       client.yield(60);
    }
  }
}

Credits

이민석

이민석

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백지원

백지원

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이중원

이중원

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Huijin Yang

Huijin Yang

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