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solenoid.ino

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+
+
+#include <SoftwareSerial.h>                           //we have to include the SoftwareSerial library, or else we can't use it.
+#define SERIAL_BUFFER_SIZE 64
+
+
+#define rx 10                                         //define what pin rx is going to be.
+#define tx 11                                         //define what pin tx is going to be.
+
+SoftwareSerial myserial(rx, tx);                      //define how the soft serial port is going to work.
+
+//ph sensor variables
+String inputstring = "";                              //a string to hold incoming data from the PC
+String sensorstring = "";                             //a string to hold the data from the Atlas Scientific product
+boolean input_stringcomplete = false;                 //have we received all the data from the PC
+boolean sensor_stringcomplete = false;                //have we received all the data from the Atlas Scientific product
+float ph;                                             //used to hold a floating point number that is the pH. 
+String data="";
+
+//flow sensor variables
+float total_volume = 0;
+volatile int flow_frequency;                // Measures flow sensor pulses
+unsigned int l_hour;                        // Calculated litres/hour
+float l_sec;                                // Calculated litres/sec
+float flowrate;
+float quantity;
+unsigned int kg_sec;
+unsigned char flowsensor = 2;               // Sensor Input
+unsigned long currentTime;
+unsigned long cloopTime;
+int solenoidPin = 4;                        // This is the output pin on the Arduino we are using
+
+void flow ()                                // Interrupt function
+{
+   flow_frequency++;
+}
+
+void setup() {                                        //set up the hardware
+
+  pinMode(flowsensor, INPUT);
+  pinMode(solenoidPin, OUTPUT);            // Sets the pin as an output
+  digitalWrite(flowsensor, HIGH);          // Optional Internal Pull-Up
+
+  currentTime = millis();
+  cloopTime = currentTime;
+
+  Serial.begin(9600);                                 //set baud rate for the hardware serial port_0 to 9600
+  myserial.begin(9600);                               //set baud rate for software serial port_3 to 9600
+  inputstring.reserve(10);                            //set aside some bytes for receiving data from the PC
+  sensorstring.reserve(30);                           //set aside some bytes for receiving data from Atlas Scientific product
+
+  attachInterrupt(0, flow, RISING);        // Setup Interrupt
+  sei();                                   // Enable interrupts
+
+}
+
+
+void serialEvent() {                                  //if the hardware serial port_0 receives a char
+  char inchar = (char)Serial.read();                  //get the char we just received
+  inputstring += inchar;                              //add it to the inputString
+  if (inchar == '\r') {                               
+    input_stringcomplete = true;                      //if the incoming character is a <CR>, set the flag
+  }
+}
+
+void loop() {                                         //here we go...
+
+  data="";
+  if (input_stringcomplete) {                         //if a string from the PC has been received in its entirety                     
+    myserial.print(inputstring);                      //send that string to the Atlas Scientific product
+    inputstring = "";                                 //clear the string
+    input_stringcomplete = false;                     //reset the flag used to tell if we have received a completed string from the PC      
+  }
+
+  if (myserial.available() > 0) {                     //if we see that the Atlas Scientific product has sent a character.
+    char inchar = (char)myserial.read();              //get the char we just received
+    sensorstring += inchar;
+    if (inchar == '\r') {
+      sensor_stringcomplete = true;                   //if the incoming character is a <CR>, set the flag
+    }
+  }
+
+
+  if (sensor_stringcomplete) {                        //if a string from the Atlas Scientific product has been received in its entirety
+    //Serial.println(sensorstring);                     //send that string to the PC's serial monitor
+    data+=sensorstring;
+
+    delay (3000);
+    sensorstring = "";                                //clear the string:
+    sensor_stringcomplete = false;                    //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
+  }
+
+
+//flowsensorcode
+    currentTime = millis();                             // Every second, calculate and print litres/hour
+    if(currentTime >= (cloopTime + 1000))
+    {
+      cloopTime = currentTime;                     // Updates cloopTime
+                                                                   // Pulse frequency (Hz) = 7.5Q, Q is flow rate in L/min.
+      l_hour = (flow_frequency * 60 / 7.5);  // (Pulse frequency x 60 min) / 7.5Q = flowrate in L/hour
+      l_sec = (l_hour * 10 / 36);
+      flowrate = l_sec;
+      total_volume = total_volume + l_sec;
+      quantity = total_volume;
+      flow_frequency = 0;                   // Reset Counter
+
+      data+=  "  flowrate: " + String(flowrate) + " mL/sec  " + "quantity: " + String(quantity) + " mL ";
+     Serial.println(data);
+     // Serial.print(l_sec);            // Print litres/sec
+      //Serial.println("mL/sec");
+      //Serial.print(total_volume);            // Print litres/sec
+      //Serial.println("mL");      
+   }
+
+}