IOT final

Circuit.ino

+int trig_pin = 8;
+int echo_pin = 9;
+long echotime; //in micro seconds
+float distance; //in cm
 
-//Ultrasonic sendor 
-const int pingPin = 7; // Trigger Pin of Ultrasonic Sensor
-const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
+const int ledPin = 13; // Built in LED in Arduino board
+String msg,cmd;
 
 //TDS
 #include <EEPROM.h>
@@ -21,7 +24,7 @@ float tdsValue = 0;
 
 float temperature = 25; 
 
-
+int turbidity_str = 0;
 
 //Turbidity
 #define sensor_pin A1
@@ -31,6 +34,13 @@ float turbidity = 0.00;
 float Vclear = 2.85; // Output voltage to calibrate (with clear water).
 int sensorValue = 0;
 
+//ph
+#define SensorPin A3          // the pH meter Analog output is connected with the Arduino’s Analog
+unsigned long int avgValue;  //Store the average value of the sensor feedback
+float b;
+int buf[10],temp;
+float phValue;
+
 
 
 
@@ -77,25 +87,40 @@ long microsecondsToCentimeters(long microseconds) {
 
 void setup()
 {   
-    Serial.begin(115200);
+  pinMode(trig_pin, OUTPUT); 
+  pinMode(echo_pin, INPUT);
+  digitalWrite(trig_pin, LOW); //Start with trigger LOW
+  
+    Serial.begin(9600); // Communication rate of the Bluetooth Module
     pinMode(TdsSensorPin,INPUT);//TDS analog input  A0
     pinMode(sensor_pin, INPUT);//Turbifity analog input A1
+
+
+
+      // Initialization
+  pinMode(ledPin, OUTPUT);
+  digitalWrite(ledPin, LOW);
+  msg = "";
 }
 
 void loop()
 {
   //Ultrasonic
-long duration, inches, cm;
-   pinMode(pingPin, OUTPUT);
-   digitalWrite(pingPin, LOW);
-   delayMicroseconds(2);
-   digitalWrite(pingPin, HIGH);
+ //trigger a pulse-echo measurement
+  digitalWrite(trig_pin, HIGH);
   delayMicroseconds(10);
-   digitalWrite(pingPin, LOW);
-   pinMode(echoPin, INPUT);
-   duration = pulseIn(echoPin, HIGH);
-   inches = microsecondsToInches(duration);
-   cm = microsecondsToCentimeters(duration);
+  digitalWrite(trig_pin, LOW);
+
+  //get the result
+  echotime= pulseIn(echo_pin, HIGH);
+  distance= 0.0001*((float)echotime*340.0)/2.0;
+  
+  //send over Bluetooth 
+ //Serial.print("*T"+String(echotime)+"*");
+  //Serial.print("*D"+String(distance,1)+"*");
+  
+  
+  delay(100);
 
    //TDS
    static unsigned long analogSampleTimepoint = millis();
@@ -140,7 +165,33 @@ voltage = sensorValue * (5.000 / 1023.000); // Convert analog (0-1023) to voltag
 
 turbidity = 100.00 - (voltage / Vclear) * 100.00; // as relative percentage; 0% = clear water;
 
+//ph
+for(int i=0;i<10;i++)       //Get 10 sample value from the sensor for smooth the value
+  { 
+    buf[i]=analogRead(SensorPin);
+    delay(10);
+  }
+  for(int i=0;i<9;i++)        //sort the analog from small to large
+  {
+    for(int j=i+1;j<10;j++)
+    {
+      if(buf[i]>buf[j])
+      {
+        temp=buf[i];
+        buf[i]=buf[j];
+        buf[j]=temp;
+      }
+    }
+  }
+  avgValue=0;
+  for(int i=2;i<8;i++)                      //take the average value of 6 center sample
+    avgValue+=buf[i];
+   phValue=(float)avgValue*5.0/1024/6; //convert the analog into millivolt
+  phValue=3.5*phValue;                      //convert the millivolt into pH value
+         
+  delay(800);
   
+/*
    //Ultrasinic
    Serial.print("Distance To Water Level : {");
    Serial.print(inches);
@@ -157,19 +208,54 @@ Serial.print("ppm }");
 
 Serial.print("  Turbidity: ");
 Serial.print(turbidity);
-Serial.print("  ");
+Serial.print("  ");  */
+
+
+if(turbidity<-28)            turbidity_str = 1;
+if(turbidity>=-28 && turbidity<-16) turbidity_str = 2;
+if(turbidity>=-16)           turbidity_str = 3;
+
 
 
-if(turbidity<-28)            Serial.print("Water Very Clean ");
-if(turbidity>=-28 && turbidity<-16) Serial.print("Water Norm Clean ");
-if(turbidity>=-16)           Serial.print("Water Very Dirty/Outside from water ");
+   // To read message received from other Bluetooth Device
+  if (Serial.available() > 0){ // Check if there is data coming
+    msg = Serial.readString(); // Read the message as String
+    Serial.println("Android Command: " + msg);
+  }
+
+  // tds
+  if (msg == "<get tds>"){
+    digitalWrite(ledPin, HIGH); // Turn on LED
+    Serial.print("tds_"); // Then send status message to Android
+    Serial.print(tdsValue);
+      Serial.println("\n");
+    msg = ""; // reset command
+  } else if (msg == "<get dis>"){
+      digitalWrite(ledPin, HIGH); // Turn off LED
+      Serial.print("distance_"); // Then send status message to Android
+      Serial.print(distance);   
+      Serial.println("\n");
+      msg = ""; // reset command
+    }
 
+    else if (msg == "<get ph>"){
+      digitalWrite(ledPin, HIGH); // Turn off LED
+      Serial.print("ph_"); // Then send status message to Android
+      Serial.print(phValue);
+      Serial.println("\n");
+      msg = ""; // reset command
+    }
 
+    else if (msg == "<get turbidity>"){
+      digitalWrite(ledPin, HIGH); // Turn off LED
      
+      Serial.print("turbidity_"); // Then send status message to Android
+      Serial.print(turbidity);
+      Serial.println("\n");
       
-   Serial.println();
+      msg = ""; // reset command
+    }
 
     
-   delay(100);
 
 }