Events display zero with hall sensor

Firmware Libraries
6

Hi, you didn't follow any of suggestion provided by @rickkas7 and @ScruffR except one:

Also you publish rate is 2 per sec you have to wait at least 2 sec for recover here is a nice explanation but with this:

you don't need to care about Publish rate ( all is done at once )

try this code (not tested):

#include "Particle.h"

#define statusLed D7 
#define sensorInterrupt D2  // 0 = digital pin 2 

/*byte sensorPin       = D2;  why why why ??? */

// The hall-effect flow sensor outputs approximately 4.5 pulses per second per litre/minute of flow. 

volatile byte pulseCount = 0;
float calibrationFactor = 4.5;
float flowRate = 0.0;

unsigned int flowMilliLitres = 0;
unsigned long totalMilliLitres = 0;
unsigned long oldTime = 0;

void setup()
{
//Initialize a serial connection for reporting values to the host

    Serial.begin(38400);

//Set up the status LED line as an output

    pinMode(statusLed, OUTPUT);
    digitalWrite(statusLed, HIGH);  // We have an active-low LED attached

//Set up internal pullup on D2 
 
    pinMode(sensorInterrupt, INPUT_PULLUP);

/*digitalWrite(sensorPin, HIGH); why why why ??? old Arduino style*/

    attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}

void loop()
{

    if((millis() - oldTime) > 1000)   // Only process counters once per second
     { 
        flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
        oldTime = millis();
        flowMilliLitres = (flowRate / 60) * 1000;
        totalMilliLitres += flowMilliLitres;
        pulseCount = 0;

        Serial.printlnf("Flow rate: %6.1f l/min \r\n"
                        "Current Liquid Flowing: %6d ml/s \r\n"
                        "Output Liquid Quantity: %6d ml"
                       , flowRate
                       , flowMilliLitres
                       , totalMilliLitres
                       );

        char msg[32];
        snprintf(msg, sizeof(msg), "%d ml/s (%d ml total)", flowMilliLitres, totalMilliLitres);
        Particle.publish("FlowRate", msg, PRIVATE);
     }
}

 void pulseCounter()
{
  pulseCount++;
}
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