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MainPrgm2.ino

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+
+#define SERIAL_BUFFER_SIZE 64
+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
+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()
+{
+   pinMode(flowsensor, INPUT);
+   pinMode(solenoidPin, OUTPUT);            // Sets the pin as an output
+   digitalWrite(flowsensor, HIGH);          // Optional Internal Pull-Up
+
+   Serial.begin(9600);
+   attachInterrupt(0, flow, RISING);        // Setup Interrupt
+   sei();                                   // Enable interrupts
+   currentTime = millis();
+   cloopTime = currentTime;
+}
+void loop ()
+{
+   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);
+      total_volume = total_volume + l_sec;
+      flow_frequency = 0;                   // Reset Counter
+      digitalWrite(solenoidPin, HIGH);    //Switch Solenoid ON
+      delay(1000);                      //Wait 1 Second
+      digitalWrite(solenoidPin, LOW);     //Switch Solenoid OFF
+
+      delay(1000);
+      Serial.print("b");
+      Serial.print(l_hour);            // Print litres/hour
+      Serial.println("L/hour");
+      Serial.print("b");
+      Serial.print(l_sec);            // Print litres/sec
+      Serial.println("mL/sec");      
+   }
+
+   Serial.print("b");
+   Serial.print(total_volume);            // Print litres/sec
+   Serial.println("mL");
+   delay(0);
+}