2 replies to this topic

[Automate]

I'm looking to get pluses from a flow meter tied to an input and calculate the flow rate and flow total. Anybody already developed code to do this?  Flow sensor puts out roughly a square wave at 450 pulses per liter, 30 L/Min max flow rate.

http://www.adafruit.com/products/828

 

Thanks for any help

 

[KiwiDev]

Hi,

 

I have a couple of similar sensors (http://www.seeedstud...id-Flow-c-25_32), we used an InterruptPort to count the pulses and a Timer to regularly calculate then display the instantaneous flow in L/Min.

 

I chopped out some of the code to show my approach, you'll need to adjust the calculation to suit your sensor.

 

Bryn

blog.devmobile.co.nz

   public class Program
   {
      private static int waterFlowCounter = 0;

      public static void Main()
      {
         InterruptPort flowCounterSensor = new InterruptPort(Pins.GPIO_PIN_D5, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeHigh);
         flowCounterSensor.OnInterrupt += new NativeEventHandler(flowCounter_OnInterrupt);

         Timer waterFlowUpdate = new Timer(waterFlowUpdateProc, null, 0, 1000);

         Thread.Sleep(Timeout.Infinite);
      }

      static void flowCounter_OnInterrupt(uint data1, uint data2, DateTime time)
      {
         Interlocked.Increment(ref waterFlowCounter);
      }

      static void waterFlowUpdateProc(object status)
      {
         int flowCount = Interlocked.Exchange(ref waterFlowCounter, 0);

         double flowLitresMinute = flowCount / 5.5 ; // 5.5 is the Q of the 3/4" sensor

         Debug.Print(flowLitresMinute.ToString("F1") + "L/m  ");
      }

[Automate]

Looks great.  Thanks